EPA 609 practice test
75 free practice questions on the Section 609 rules for motor vehicle air conditioning. Each answer is explained and linked to the official source it comes from.
EPA 609
75 questions across 12 topics. After each answer you see why it is right, with a link to the official source.
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Who must be certified
1. A mechanic is paid to replace a car's water pump and does no work on the air conditioning refrigerant circuit. Under 40 CFR 82.30(b), do the Subpart B motor vehicle air conditioner rules apply to that job?
- A. Yes, because they cover every paid repair on a motor vehicle
- B. No, because the service does not involve the refrigerant in the motor vehicle air conditioner
- C. Yes, whenever the vehicle is equipped with an air conditioner
- D. Yes, but only if the mechanic works at a new-car dealership
Show answer
Answer: B. No, because the service does not involve the refrigerant in the motor vehicle air conditioner
Subpart B applies to "any person performing service on a motor vehicle for consideration when this service involves the refrigerant in the motor vehicle air conditioner." Being paid is only half of the test; a job that never touches the refrigerant is outside it.
Source: eCFR: 40 CFR 82.30, Purpose and scope (as of Nov 3, 2026)
2. A facility only charges MVAC-like appliances with refrigerant (top-offs) and does no other refrigerant service. Under 40 CFR 82.32(e)(4), which requirement applies to it?
- A. It must purchase approved refrigerant recycling equipment, but no certification is needed
- B. It must be properly trained and certified by a program approved under § 82.40 or § 82.161(a)(5)
- C. Nothing, because top-offs of MVAC-like appliances are exempt
- D. It only needs to keep a log of refrigerant purchases
Show answer
Answer: B. It must be properly trained and certified by a program approved under § 82.40 or § 82.161(a)(5)
For facilities that only charge MVAC-like appliances, the rule "does not include the requirement to purchase approved refrigerant recycling equipment, but does include the requirement to be properly trained and certified." So an answer that drops certification is wrong. A separate paragraph, § 82.32(e)(5), says all persons opening MVAC-like appliances "must have at least one piece of approved recovery or recycling equipment available at their place of business"; "opening" is defined in § 82.152, not in Subpart B.
3. Under 40 CFR 82.34(c), when may a technician training program issue certificates?
- A. Only if the program complies with all of the standards in § 82.40(a)
- B. Once it has trained at least 100 technicians
- C. Whenever a technician pays the program's fee
- D. Once a state licensing board has reviewed its test
Show answer
Answer: A. Only if the program complies with all of the standards in § 82.40(a)
"No technician training programs may issue certificates unless the program complies with all of the standards in § 82.40(a)." Those standards cover training, test subject material, test administration and proof of certification.
Source: eCFR: 40 CFR 82.34, Prohibitions and required practices (as of Nov 3, 2026)
Definitions
4. Under 40 CFR 82.32(b), who certifies equipment as "approved refrigerant recycling equipment" meeting one of the standards in § 82.36?
- A. Any repair shop that has used the equipment for a year
- B. The equipment's manufacturer, by its own declaration
- C. The EPA Administrator or an organization approved under § 82.38
- D. The state agency that registers motor vehicles
Show answer
Answer: C. The EPA Administrator or an organization approved under § 82.38
Approved refrigerant recycling equipment means "equipment certified by the Administrator or an organization approved under § 82.38 as meeting either one of the standards in § 82.36." A manufacturer's own claim, a shop's experience or a state vehicle agency is not named.
5. Under 40 CFR 82.32(e)(1), "properly using" equipment means using it in conformity with the Subpart B regulations. Which of these does the definition expressly include?
- A. The repair shop's own pricing policy for refrigerant work
- B. Whatever procedure the vehicle owner asks for
- C. The recommended service procedures and practices for the containment of refrigerant set forth in § 82.36(a) and the appendices to Subpart B
- D. The state's vehicle emissions inspection schedule
Show answer
Answer: C. The recommended service procedures and practices for the containment of refrigerant set forth in § 82.36(a) and the appendices to Subpart B
Properly using includes "the prohibitions and required practices set forth in § 82.34, and the recommended service procedures and practices for the containment of refrigerant set forth in § 82.36(a) and appendices A, B, C, D, E, and F to this subpart, as applicable." Pricing, owner requests and inspection schedules are not part of the definition.
6. Which vehicle falls outside EPA's definition of a "motor vehicle" in Subpart B?
- A. A light duty delivery van
- B. A heavy duty truck used on highways
- C. A vehicle whose final assembly has not been completed by the original equipment manufacturer
- D. A passenger car owned by a private person
Show answer
Answer: C. A vehicle whose final assembly has not been completed by the original equipment manufacturer
The definition "does not include a vehicle where final assembly of the vehicle has not been completed by the original equipment manufacturer." Passenger cars, light duty vehicles and heavy duty vehicles are named as included.
7. EPA's definition of "motor vehicle air conditioners" in 40 CFR 82.32(d) describes them as which kind of equipment?
- A. Mechanical vapor compression refrigeration equipment used to cool the driver's or passenger's compartment
- B. Thermoelectric cooling modules mounted in the dashboard
- C. Absorption refrigeration equipment driven by engine exhaust heat
- D. Evaporative coolers that spray water into the incoming air
Show answer
Answer: A. Mechanical vapor compression refrigeration equipment used to cool the driver's or passenger's compartment
Motor vehicle air conditioners means "mechanical vapor compression refrigeration equipment used to cool the driver's or passenger's compartment of any motor vehicle." The definition names vapor compression, not absorption, thermoelectric or evaporative cooling.
8. Under Subpart B, since November 15, 1995, what does the term "refrigerant" include besides class I and class II substances used in an MVAC?
- A. Only HCFC-22
- B. Engine coolant and antifreeze
- C. Any substitute substance
- D. Nothing else; substitutes are never covered
Show answer
Answer: C. Any substitute substance
Refrigerant means any class I or class II substance used in an MVAC, and "effective November 15, 1995, refrigerant shall also include any substitute substance." Substitutes are covered, so the answer saying they never are is wrong.
9. Which business is a "motor vehicle disposal facility" under Subpart B?
- A. A collision repair shop
- B. A dealership's service department
- C. A scrap yard that crushes vehicles with MVACs
- D. A mobile repair van that services MVACs
Show answer
Answer: C. A scrap yard that crushes vehicles with MVACs
A motor vehicle disposal facility is a commercial facility engaged in disposal, which "includes dismantling, crushing or recycling," such as scrap yards. "Motor vehicle repair and/or servicing facilities, including collision repair facilities, are not considered motor vehicle disposal facilities."
Required practices
10. A facility is paid to top off motor vehicle air conditioners (MVACs) with refrigerant and does no other refrigerant service. Under 40 CFR 82.32(e)(4), what equipment rule applies to it?
- A. It must purchase approved refrigerant recycling equipment
- B. It needs no equipment because it never removes refrigerant
- C. It needs equipment only if it also services MVAC-like appliances
- D. It must rent approved equipment only on days it does top-offs
Show answer
Answer: A. It must purchase approved refrigerant recycling equipment
Top-off-only facilities are "subject to any and all requirements" that apply to wider refrigerant servicing, and "for facilities that charge MVACs, this includes the requirement to purchase approved refrigerant recycling equipment." Doing only top-offs is not an exemption.
11. A shop is paid to replace a leaking hose on a car's air conditioner that still holds refrigerant, a job during which discharge of refrigerant from the MVAC can reasonably be expected. Under 40 CFR 82.32(e)(2), when must approved equipment be used to extract the refrigerant?
- A. Only after the old hose has been removed from the system
- B. Only if the system still holds more than half of its charge
- C. Never, because the leaking hose has already released refrigerant
- D. Before the service is performed
Show answer
Answer: D. Before the service is performed
Section 82.32(e)(2) says "approved equipment must be used to extract refrigerant prior to performing any service during which discharge of refrigerant from the motor vehicle air conditioner can reasonably be expected." It adds that "Intentionally venting or disposing of refrigerant to the atmosphere is an improper use of equipment."
12. A shop uses equipment that only recovers refrigerant (it does not recycle). What must the shop do with the recovered refrigerant to be "properly using" the equipment?
- A. Store it indefinitely in the recovery tank
- B. Recycle it on-site or send it off-site for reclamation
- C. Put it straight back into the vehicle
- D. Sell it to any buyer who asks
Show answer
Answer: B. Recycle it on-site or send it off-site for reclamation
For recover-only equipment, "properly using includes the requirement to recycle the refrigerant on-site or send the refrigerant off-site for reclamation." Putting it straight back skips the required recycling or reclamation.
13. When may MVAC refrigerant be recycled off-site (rather than reclaimed)?
- A. Whenever any other repair shop that owns recycling equipment agrees to do it
- B. Only if it was extracted with recover-only equipment and is then recycled off-site by equipment owned by the person who owns the recover-only equipment and owns or operates the establishment where it was extracted
- C. Whenever a certified technician signs a transfer form
- D. Only on the same day the refrigerant was extracted
Show answer
Answer: B. Only if it was extracted with recover-only equipment and is then recycled off-site by equipment owned by the person who owns the recover-only equipment and owns or operates the establishment where it was extracted
Refrigerant "may be recycled off-site only if" it was extracted with recover-only equipment and recycled "by equipment owned by the person that owns both the recover only equipment and owns or operates the establishment" where it was extracted. An unrelated shop's equipment does not meet that ownership condition.
14. A technician certified under § 82.34(a)(2) buys refrigerant whose sale is restricted under Subpart F. It was extracted from an MVAC bound for disposal at a motor vehicle disposal facility and was not reclaimed. Under § 82.34(d)(2), how may the technician re-use it?
- A. Only after selling it back to the disposal facility
- B. In any refrigeration or air conditioning appliance, as long as it is used within one year
- C. In any MVAC exactly as it came from the disposal facility
- D. Only in an MVAC or MVAC-like appliance, and only if it has been reclaimed or properly recycled
Show answer
Answer: D. Only in an MVAC or MVAC-like appliance, and only if it has been reclaimed or properly recycled
The paragraph says such a technician "may subsequently re-use such refrigerant only in an MVAC or MVAC-like appliance, and only if it has been reclaimed or properly recycled." Using it as-is, or in other kinds of appliances, does not meet both conditions.
Source: eCFR: 40 CFR 82.34, Prohibitions and required practices (as of Nov 3, 2026)
15. Under 40 CFR 82.34(e), when may refrigerant handling equipment manufactured or imported for use during the maintenance, service or repair of MVACs for consideration be introduced into interstate commerce?
- A. Whenever it is labeled for professional use
- B. After it has been used in the field for one year
- C. Only if it meets the requirements of § 82.36
- D. Whenever the importer pays a registration fee
Show answer
Answer: C. Only if it meets the requirements of § 82.36
Such equipment "cannot be introduced into interstate commerce unless meeting the requirements of § 82.36." A label, field use or a fee does not replace meeting the equipment standards.
Source: eCFR: 40 CFR 82.34, Prohibitions and required practices (as of Nov 3, 2026)
16. Refrigerant is recovered from an MVAC bound for disposal at a motor vehicle disposal facility, using approved refrigerant recycling equipment dedicated for use with MVACs and MVAC-like appliances. It will not be reclaimed. Under § 82.34(d)(1)(ii)(B), what must happen before it is charged into another MVAC?
- A. Nothing; it may be charged into another MVAC as recovered
- B. It must be returned to the company that originally produced it
- C. It must be inspected at an EPA regional office
- D. It must be recycled by the facility that charges or recharges it, properly using approved refrigerant recycling equipment
Show answer
Answer: D. It must be recycled by the facility that charges or recharges it, properly using approved refrigerant recycling equipment
The refrigerant must be "Subsequently recycled by the facility that charges or recharges the refrigerant into an MVAC or MVAC-like appliance, properly using approved refrigerant recycling equipment in accordance with any applicable recommended service procedures set forth in the appendices to this subpart B." Recovery alone is not enough.
Source: eCFR: 40 CFR 82.34, Prohibitions and required practices (as of Nov 3, 2026)
Approved equipment
17. Under the SAE J1990 equipment specification in Appendix A, how must CFC-12 (R-12) recycling equipment deal with noncondensable gases (NCGs)?
- A. It must automatically purge NCGs if the acceptable level is exceeded, or have a device that alerts the operator that the NCG level has been exceeded
- B. It must release all refrigerant along with the NCGs at the end of each job
- C. It may ignore NCGs, because only moisture matters
- D. It must ship every container with NCGs to a reclaimer
Show answer
Answer: A. It must automatically purge NCGs if the acceptable level is exceeded, or have a device that alerts the operator that the NCG level has been exceeded
"The equipment shall either automatically purge noncondensables (NCGs) if the acceptable level is exceeded or incorporate a device to alert the operator that NCG level has been exceeded." NCG removal "must be part of normal operation of the equipment."
Source: eCFR: 40 CFR Part 82, Subpart B, Appendix A (as of Nov 3, 2026)
18. A technician takes the shop's approved refrigerant recycling equipment to a customer's location to service an MVAC there. What does the rule say?
- A. This is allowed, and the service must meet all Subpart B requirements that would apply on-site
- B. Approved equipment may never leave the shop
- C. This is allowed, and on-site recordkeeping rules no longer apply
- D. This is allowed only for top-offs
Show answer
Answer: A. This is allowed, and the service must meet all Subpart B requirements that would apply on-site
Approved refrigerant recycling equipment "may be transported off-site" for service at other locations, and that servicing "must meet all of the requirements of this subpart B that would apply if the servicing occurred on-site." Moving off-site does not relax any requirement.
19. What equipment must a person who opens MVAC-like appliances have available at their place of business?
- A. None, if the technician is certified
- B. At least one piece of approved recovery or recycling equipment
- C. Access to a neighboring shop's equipment by written agreement
- D. Equipment only if they open more than ten appliances a year
Show answer
Answer: B. At least one piece of approved recovery or recycling equipment
Section 82.32(e)(5) says all persons opening (as defined in § 82.152) MVAC-like appliances "must have at least one piece of approved recovery or recycling equipment available at their place of business." Certification does not replace this, and the rule sets no yearly count.
20. Under 40 CFR 82.36(c), how does the EPA Administrator maintain the list of approved refrigerant handling equipment?
- A. By the name of each repair shop that owns the equipment
- B. By manufacturer and model
- C. By the state where the equipment was sold
- D. By the price of the equipment
Show answer
Answer: B. By manufacturer and model
"The Administrator will maintain a list of approved equipment by manufacturer and model." The list is not organized by owner, state or price.
Source: eCFR: 40 CFR 82.36, Approved refrigerant handling equipment (as of Nov 3, 2026)
21. A machine recovers, but does not recycle, a single, specific MVAC refrigerant that is not CFC-12, HFC-134a or HFO-1234yf. Under 40 CFR 82.36(a)(7), which standards must it meet?
- A. Appendix F of Subpart B
- B. Appendix A of Subpart B
- C. Appendix E of Subpart B
- D. Appendix H of Subpart G
Show answer
Answer: A. Appendix F of Subpart B
"Equipment that recovers but does not recycle refrigerants other than CFC-12, HFC-134a, and HFO-1234yf must meet the standards set forth in appendix F of this subpart." Appendix A covers CFC-12 recover-and-recycle equipment and Appendix E covers CFC-12 and HFC-134a equipment using common circuitry.
Source: eCFR: 40 CFR 82.36, Approved refrigerant handling equipment (as of Nov 3, 2026)
Refrigerant sales
22. A buyer who is not certified under § 82.40 wants to buy small cans (under 20 pounds) of a class I or class II refrigerant suitable for MVACs. When may a seller sell to this buyer?
- A. When the buyer says the refrigerant is for their own car
- B. When the buyer shows a driver's license
- C. When the buyer intends the containers for resale only and so certifies to the seller
- D. When the buyer buys a full case of cans
Show answer
Answer: C. When the buyer intends the containers for resale only and so certifies to the seller
Sales of these small containers are allowed only to a person who is "properly trained and certified under § 82.40 or intended the containers for resale only, and so certifies to the seller." Personal use is not an exception.
Source: eCFR: 40 CFR 82.34, Prohibitions and required practices (as of Nov 3, 2026)
23. As a promotion, a parts store gives away a 12-ounce can of CFC-12 refrigerant, free, to a customer who is not certified under § 82.40 and is not buying for resale. Does § 82.34(b) reach this giveaway?
- A. No, because no money changed hands
- B. No, because cans holding less than one pound are exempt
- C. No, because the rule regulates only the person who receives the can
- D. Yes, because the paragraph covers distributing such containers, not only selling them
Show answer
Answer: D. Yes, because the paragraph covers distributing such containers, not only selling them
Section 82.34(b) says "no person may sell or distribute, or offer for sale or distribution" such refrigerant in "a container which contains less than 20 pounds of such refrigerant to any person unless that person is properly trained and certified under § 82.40 or intended the containers for resale only." A free can is still distributed, and a 12-ounce can is well under 20 pounds.
Source: eCFR: 40 CFR 82.34, Prohibitions and required practices (as of Nov 3, 2026)
24. A person sells a class I or class II refrigerant suitable for MVAC use in a container of less than 20 pounds. Unless the buyer is purchasing for resale only, what must the seller do?
- A. Verify that the purchaser is properly trained and certified under 40 CFR 82.40
- B. Collect a deposit on the container
- C. Have the buyer read the store's sign aloud
- D. Check the buyer's vehicle registration
Show answer
Answer: A. Verify that the purchaser is properly trained and certified under 40 CFR 82.40
The seller "must verify that the purchaser is properly trained and certified under § 82.40" and "must have a reasonable basis for believing that the information presented by the purchaser is accurate." A vehicle registration or deposit does not show certification.
25. A buyer purchases small containers (less than 20 pounds) of class I or class II MVAC refrigerant for resale only. What must the seller obtain?
- A. Nothing at all
- B. A verbal promise that the containers will be resold
- C. A copy of the purchaser's tax return
- D. A written statement from the purchaser that the containers are for resale only, with the purchaser's name and business address
Show answer
Answer: D. A written statement from the purchaser that the containers are for resale only, with the purchaser's name and business address
For resale-only purchases, "the seller must obtain a written statement from the purchaser that the containers are for resale only and indicate the purchasers name and business address." A verbal promise is not a written statement, and the exception still requires paperwork.
26. A store makes retail sales of class I or class II MVAC refrigerant in containers of less than 20 pounds. Where must it display the required federal sign?
- A. Only in the employee break room
- B. Only on the store's website
- C. Prominently, where sales of such containers occur
- D. Only at the loading dock
Show answer
Answer: C. Prominently, where sales of such containers occur
The seller "must prominently display a sign where sales of such containers occur." A break room, website or loading dock is not where customers buy the containers.
27. What does the sign required at retail sales of small containers of class I and class II MVAC refrigerant state?
- A. It is a violation of federal law to sell containers of Class I and Class II refrigerant of less than 20 pounds of such refrigerant to anyone who is not properly trained and certified to operate approved refrigerant recycling equipment.
- B. Refrigerant sales are limited to two containers per customer.
- C. It is a violation of federal law to sell refrigerant to anyone under 18 years of age.
- D. Customers must return empty containers to receive a deposit refund.
Show answer
Answer: A. It is a violation of federal law to sell containers of Class I and Class II refrigerant of less than 20 pounds of such refrigerant to anyone who is not properly trained and certified to operate approved refrigerant recycling equipment.
The sign states: "It is a violation of federal law to sell containers of Class I and Class II refrigerant of less than 20 pounds of such refrigerant to anyone who is not properly trained and certified to operate approved refrigerant recycling equipment." The rule ties sales to certification, not to age, quantity limits or deposits.
Disposal facilities
28. At a motor vehicle disposal facility, refrigerant from an MVAC bound for disposal is recovered with approved refrigerant recycling equipment dedicated for use with MVACs and MVAC-like appliances, to be recycled later by the facility that recharges it. Who may do this recovery?
- A. Only an EPA inspector
- B. Only the facility that will later recharge the refrigerant
- C. Only a technician employed by a reclamation facility
- D. A certified technician, or an employee, owner, or operator of, or contractor to, the disposal facility
Show answer
Answer: D. A certified technician, or an employee, owner, or operator of, or contractor to, the disposal facility
The recovery may be done "either by a technician certified under paragraph (a)(2) of this section, or by an employee, owner, or operator of, or contractor to, the disposal facility." The disposal facility's own staff are allowed.
Source: eCFR: 40 CFR 82.34, Prohibitions and required practices (as of Nov 3, 2026)
29. Refrigerant whose sale is restricted under Subpart F is extracted from an MVAC bound for disposal at a motor vehicle disposal facility and is not reclaimed. Who may it be sold to before re-use?
- A. Anyone who pays for it
- B. Any business holding a resale certificate
- C. Only a technician certified under § 82.34(a)(2)
- D. Any other disposal facility
Show answer
Answer: C. Only a technician certified under § 82.34(a)(2)
Such refrigerant "may be sold prior to its subsequent re-use only to a technician certified under paragraph (a)(2) of this section." A resale certificate is not named as an option for this refrigerant.
Source: eCFR: 40 CFR 82.34, Prohibitions and required practices (as of Nov 3, 2026)
Technician certification
30. Which of these is one of the ways an EPA-approved MVAC technician program may provide its training?
- A. A signed note from the shop owner in place of training
- B. A registration fee paid in place of training
- C. Self-study of instructional material
- D. Taking the test with no training offered
Show answer
Answer: C. Self-study of instructional material
Programs must provide training "through one or more of the following means: on-the-job training, training through self-study of instructional material, or on-site training involving instructors, videos or a hands-on demonstration." A fee or a signed note is not one of the listed means of training.
Source: eCFR: 40 CFR 82.40, Technician training and certification (as of Nov 3, 2026)
31. Which subject must the certification tests of an approved MVAC technician program cover?
- A. Engine tune-up procedures
- B. The environmental consequences of refrigerant release and the effects of ozone layer depletion
- C. Retail pricing of refrigerant
- D. Shop insurance requirements
Show answer
Answer: B. The environmental consequences of refrigerant release and the effects of ozone layer depletion
The tests must cover "the environmental consequences of refrigerant release and the adverse effects of stratospheric ozone layer depletion," along with the service standards, future developments and the section 609 requirements. Engine tune-ups, pricing and insurance are not on the list.
Source: eCFR: 40 CFR 82.40, Technician training and certification (as of Nov 3, 2026)
32. Who may grade a completed MVAC technician certification test?
- A. An entity or individual who receives no benefit based on the outcome (a grading fee is allowed)
- B. An instructor who is paid a bonus for each passing score
- C. The technician who took the test
- D. Anyone at all, as long as no fee is charged
Show answer
Answer: A. An entity or individual who receives no benefit based on the outcome (a grading fee is allowed)
Tests "must be graded by an entity or individual who receives no benefit based on the outcome of testing; a fee may be charged for grading." A bonus for passing scores is a benefit based on the outcome, and charging no fee does not make any grader acceptable.
Source: eCFR: 40 CFR 82.40, Technician training and certification (as of Nov 3, 2026)
33. What must each MVAC certification test provide about the person taking it?
- A. A means of verifying the identification of the individual taking the test
- B. A photo of the technician's vehicle
- C. A letter from a vehicle manufacturer
- D. Proof of two years of work experience
Show answer
Answer: A. A means of verifying the identification of the individual taking the test
"Each test must provide a means of verifying the identification of the individual taking the test." The rule does not ask for work experience, vehicle photos or manufacturer letters.
Source: eCFR: 40 CFR 82.40, Technician training and certification (as of Nov 3, 2026)
34. A technician takes an MVAC certification test with the help of a translator. What must the certificate show?
- A. That the certificate is temporary
- B. Nothing different; the certificate looks the same
- C. That translator assistance was required
- D. That the test must be retaken in English
Show answer
Answer: C. That translator assistance was required
"If a translator is used, the certificate received must indicate that translator assistance was required." Programs are "encouraged to make provisions for non-English speaking technicians," and the rule says nothing about a temporary certificate or an English retest.
Source: eCFR: 40 CFR 82.40, Technician training and certification (as of Nov 3, 2026)
35. What must an approved MVAC certification program give a technician who passes the test?
- A. Only a verbal confirmation from the instructor
- B. Individual proof of certification, such as a certificate, wallet-sized card or display card
- C. Proof only after one year of service work
- D. Nothing; the program keeps the result private
Show answer
Answer: B. Individual proof of certification, such as a certificate, wallet-sized card or display card
Each program "must offer individual proof of certification, such as a certificate, wallet-sized card, or display card, upon successful completion of the test." A verbal confirmation or a delay of a year does not meet that.
Source: eCFR: 40 CFR 82.40, Technician training and certification (as of Nov 3, 2026)
36. What number must an approved MVAC certification program provide for each certified technician?
- A. A unique number for each certified technician
- B. The shop's EPA region number
- C. One shared number for all technicians at the same shop
- D. The VIN of the first vehicle the technician services
Show answer
Answer: A. A unique number for each certified technician
"Each certification program must provide a unique number for each certified technician." A number shared by a whole shop, a region number or a VIN is not unique to the technician.
Source: eCFR: 40 CFR 82.40, Technician training and certification (as of Nov 3, 2026)
37. Where may authorized representatives of EPA require MVAC technicians to show they can properly recover and/or recycle refrigerant?
- A. Only at an EPA regional office
- B. On the business entity's premises
- C. Only by a written exam sent by mail
- D. Only at the training program's test site
Show answer
Answer: B. On the business entity's premises
Authorized representatives "may require technicians to demonstrate on the business entity's premises their ability to perform proper procedures for recovering and/or recycling refrigerant." The rule names the business premises, not an EPA office or a test site.
Source: eCFR: 40 CFR 82.40, Technician training and certification (as of Nov 3, 2026)
38. EPA revokes an MVAC technician's certificate after a failed demonstration. What must the technician do before servicing or repairing any motor vehicle air conditioner again?
- A. Wait 30 days
- B. Be recertified
- C. Have the shop owner sign for the work
- D. Pay a fee to the equipment manufacturer
Show answer
Answer: B. Be recertified
"Technicians whose certification is revoked must be recertified before servicing or repairing any motor vehicle air conditioners." Waiting, an owner's signature or a fee does not replace recertification.
Source: eCFR: 40 CFR 82.40, Technician training and certification (as of Nov 3, 2026)
Shop certification and records
39. Besides naming the purchaser, the address and the equipment, the signed certification statement under 40 CFR 82.42(a)(1) must include a statement about the people the purchaser authorizes to perform service. What must it say about them?
- A. That each of them has at least two years of motor vehicle air conditioning experience
- B. That each of them was trained by the equipment's manufacturer
- C. That each of them holds a state mechanic's license
- D. That each individual authorized by the purchaser to perform service is properly trained and certified in accordance with § 82.40
Show answer
Answer: D. That each individual authorized by the purchaser to perform service is properly trained and certified in accordance with § 82.40
The certification "must also include a statement that the equipment will be properly used in servicing motor vehicle air conditioners, that each individual authorized by the purchaser to perform service is properly trained and certified in accordance with § 82.40, and that the information given is true and correct." Work experience, a state license or manufacturer training is not what the statement covers.
40. Which equipment details must a shop's signed certification statement to EPA include?
- A. The manufacturer name, model number, date of manufacture and serial number of the equipment
- B. The names of the shop's customers
- C. The equipment's purchase price
- D. The brand of refrigerant the shop buys
Show answer
Answer: A. The manufacturer name, model number, date of manufacture and serial number of the equipment
The statement sets forth "the manufacturer name and equipment model number, the date of manufacture, and the serial number of the equipment," along with the purchaser's name and the establishment's address. Price, customer names and refrigerant brand are not listed.
41. A person owns approved refrigerant recycling equipment certified under 40 CFR 82.36(a)(2). What record must they keep about refrigerant sent off-site?
- A. The license plate of every vehicle serviced
- B. The daily outdoor temperature
- C. The name and address of any facility to which refrigerant is sent
- D. The price paid for each container
Show answer
Answer: C. The name and address of any facility to which refrigerant is sent
The owner "must maintain records of the name and address of any facility to which refrigerant is sent." License plates, temperatures and prices are not part of this record.
42. What records about equipment operators must an owner of approved refrigerant recycling equipment keep?
- A. Records showing that all persons authorized to operate the equipment are currently certified under 40 CFR 82.40
- B. Each operator's home address
- C. Each operator's weekly work hours
- D. Each operator's driver's license number
Show answer
Answer: A. Records showing that all persons authorized to operate the equipment are currently certified under 40 CFR 82.40
The owner "must retain records demonstrating that all persons authorized to operate the equipment are currently certified under § 82.40." The rule asks for proof of current certification, not home addresses, hours or license numbers.
43. An authorized representative of the EPA Administrator arrives at a business that services MVACs for consideration and presents credentials. Under 40 CFR 82.42(b)(5), what must the business do?
- A. Allow entry onto its premises and give access to all records required under § 82.42
- B. Refuse entry until a court order is shown
- C. Allow entry but keep its records closed
- D. Mail copies of its records to EPA within 90 days instead
Show answer
Answer: A. Allow entry onto its premises and give access to all records required under § 82.42
Such entities "must allow an authorized representative of the Administrator entry onto their premises (upon presentation of his or her credentials) and give the authorized representative access to all records required to be maintained pursuant to this section." Both entry and record access are required.
44. Where must entities that service motor vehicle air conditioners for consideration keep their required records?
- A. At the nearest EPA regional office
- B. At the equipment manufacturer
- C. On-site
- D. At the technician's home
Show answer
Answer: C. On-site
"Entities which service motor vehicle air conditioners for consideration must keep these records on-site." The records are also opened to EPA's authorized representative on the premises, so sending them elsewhere does not meet the rule.
Service procedures
45. Following Appendix A's checking procedure, a technician has already vented a small amount of vapor from the top of a stored container of recycled R-12 into the recycle equipment, but the container pressure still exceeds Table 1. What does the procedure call for next?
- A. Use the refrigerant anyway, because venting has already been tried
- B. Release the rest of the container's vapor to the atmosphere
- C. Add virgin R-12 to the container and check it again
- D. Recycle the entire contents of the container
Show answer
Answer: D. Recycle the entire contents of the container
Step 5.7 reads: "If the container still exceeds the pressure shown on Table 1, the entire contents of the container shall be recycled." The refrigerant may be used only when the pressure is below the Table 1 values, and venting to the atmosphere is not part of the procedure.
Source: eCFR: 40 CFR Part 82, Subpart B, Appendix A (as of Nov 3, 2026)
46. Under the R-12 containment procedure in Appendix A, a manifold gage set is being disconnected from the vehicle's air-conditioning system. What should be done with the gage set hoses first?
- A. Empty them into a disposable refrigerant can
- B. Open the hose valves so the hoses empty to the air
- C. Cap the hose ends and store them still charged
- D. Attach them to the reclaim equipment to recover the refrigerant from the hoses
Show answer
Answer: D. Attach them to the reclaim equipment to recover the refrigerant from the hoses
"When the manifold gage set is disconnected from the air-conditioning system or when the center hose is moved to another device which cannot accept refrigerant pressure, the gage set hoses should first be attached to the reclaim equipment to recover the refrigerant from the hoses." The procedure also says recycled refrigerant "should not be salvaged or stored in disposable refrigerant containers."
Source: eCFR: 40 CFR Part 82, Subpart B, Appendix A (as of Nov 3, 2026)
47. Under Appendix A, a near-empty disposable R-12 container is attached to the recovery unit so the remaining refrigerant can be removed before the container is thrown away. When can the container valve be closed?
- A. After the recovery unit has run for one minute, whatever the container pressure
- B. When the container has been reduced from a pressure to a vacuum
- C. Before the recovery unit is started, so no air enters it
- D. As soon as the container feels cold to the touch
Show answer
Answer: B. When the container has been reduced from a pressure to a vacuum
Step 8.2 reads: "Attach the container to the recovery unit and remove the remaining refrigerant. When the container has been reduced from a pressure to a vacuum, the container valve can be closed." Then "The container should be marked empty and is ready for disposal."
Source: eCFR: 40 CFR Part 82, Subpart B, Appendix A (as of Nov 3, 2026)
48. Under Appendix A's procedure for checking a stored container of recycled R-12 for excess noncondensable gases, where is the air temperature measured?
- A. Outdoors, in the shade
- B. Within 4 in (10 cm) of the container surface
- C. Inside the passenger compartment of the vehicle
- D. At the shop's wall thermostat
Show answer
Answer: B. Within 4 in (10 cm) of the container surface
The step reads: "With a calibrated thermometer, measure the air temperature within 4 in (10 cm) of the container surface." The pressure is read with "a calibrated pressure gage, with 1 psig divisions."
Source: eCFR: 40 CFR Part 82, Subpart B, Appendix A (as of Nov 3, 2026)
49. Under the SAE J1990 equipment specification in Appendix A, why must the equipment's lubricant measuring system take into account refrigerant dissolved in the lubricant sample?
- A. Dissolved refrigerant makes the sample look smaller than it is, so the vehicle would get too little lubricant
- B. Dissolved refrigerant raises the moisture limit of the recycled refrigerant
- C. Dissolved refrigerant creates the illusion that more lubricant has been recovered than actually has been, which could lead to overcharging the vehicle system with lubricant
- D. Dissolved refrigerant must be counted so the shop can bill the customer for it
Show answer
Answer: C. Dissolved refrigerant creates the illusion that more lubricant has been recovered than actually has been, which could lead to overcharging the vehicle system with lubricant
Item 7.7 says "Refrigerant dissolves in lubricant sample. This creates the illusion that more lubricant has been recovered than actually has been." The measuring system must account for it "to prevent overcharging the vehicle system with lubricant."
Source: eCFR: 40 CFR Part 82, Subpart B, Appendix A (as of Nov 3, 2026)
50. Under the R-12 recovery procedure in Appendix A, once recovery from the vehicle is complete, what is done before proceeding with the repair?
- A. Remove the service lines first, then close their valves
- B. Leave the service lines connected with valves open during the repair
- C. Vent the refrigerant left in the service lines
- D. Close the valves in the service lines, then remove the service lines from the vehicle system
Show answer
Answer: D. Close the valves in the service lines, then remove the service lines from the vehicle system
The step reads: "Close the valves in the service lines and then remove the service lines from the vehicle system. Proceed with the repair/service." Removing the lines before closing the valves reverses that order.
Source: eCFR: 40 CFR Part 82, Subpart B, Appendix A (as of Nov 3, 2026)
Substitute refrigerants
51. Under 40 CFR 82.170(a), what is the purpose of the SNAP regulations in Subpart G?
- A. To implement section 609 of the Clean Air Act on technician certification for motor vehicle air conditioner service
- B. To set the sign that stores must post where small cans of refrigerant are sold
- C. To set the purity standard for recycled refrigerant returned to motor vehicle air conditioners
- D. To implement section 612 of the Clean Air Act on the acceptability of substitutes for ozone-depleting compounds
Show answer
Answer: D. To implement section 612 of the Clean Air Act on the acceptability of substitutes for ozone-depleting compounds
Section 82.170(a) says the purpose is "to implement section 612 of the Clean Air Act" regarding "the acceptability of substitutes for ozone-depleting compounds." Section 609 technician certification is handled in Subpart B, not in the SNAP program.
Source: eCFR: 40 CFR 82.170, Purpose and scope (as of Nov 3, 2026)
52. How does 40 CFR 82.172 define a "substitute" (or "alternative") under the SNAP program?
- A. Any chemical, product substitute, or alternative manufacturing process, existing or new, intended for use as a replacement for a class I or II compound
- B. Only a newly invented chemical that has never been sold before
- C. Only a refrigerant that EPA has already listed as acceptable without conditions
- D. Any mixture or blend of two or more compounds
Show answer
Answer: A. Any chemical, product substitute, or alternative manufacturing process, existing or new, intended for use as a replacement for a class I or II compound
The definition covers "any chemical, product substitute, or alternative manufacturing process, whether existing or new, intended for use as a replacement for a class I or II compound." It is not limited to new chemicals ("whether existing or new"), and "any mixture or blend of two or more compounds" is the separate definition of "mixture."
Source: eCFR: 40 CFR 82.172, Definitions (as of Nov 3, 2026)
53. In the Appendix B entry that lists HFO-1234yf as a CFC-12 substitute in automobile motor vehicle air conditioning, which equipment does the application cover?
- A. Any vehicle, as long as the shop owns approved recovery equipment
- B. Retrofit of existing CFC-12 systems in any vehicle
- C. Household refrigerators and freezers
- D. New equipment in passenger cars and light-duty trucks only
Show answer
Answer: D. New equipment in passenger cars and light-duty trucks only
The application column reads "New equipment in passenger cars and light-duty trucks only," and the decision is "Acceptable subject to use conditions." The entry does not cover retrofits of CFC-12 systems, and other Appendix B rows cover other kinds of new vehicles separately.
Source: eCFR: 40 CFR Part 82, Subpart G, Appendix B (as of Nov 3, 2026)
54. Under condition (2) for HFO-1234yf in Appendix B (as of June 3, 2022), who must conduct a Failure Mode and Effect Analysis (FMEA) as provided in SAE J1739, and for what minimum period must it be kept on file?
- A. Manufacturers, for at least one year from the date of creation
- B. Service technicians, for at least three years after each repair
- C. Manufacturers, for at least three years from the date of creation
- D. Shop owners, for at least five years after buying the refrigerant
Show answer
Answer: C. Manufacturers, for at least three years from the date of creation
Condition (2) says "Manufacturers must conduct Failure Mode and Effect Analysis (FMEA)" and "must keep the FMEA on file for at least three years from the date of creation." This condition binds manufacturers, not service technicians or shop owners.
Source: eCFR: 40 CFR Part 82, Subpart G, Appendix B (as of Nov 3, 2026)
55. What do EPA's comments in the Appendix B HFO-1234yf entries note about recharging MVAC systems with HFO-1234yf, consistent with EPA's Significant New Use Rule under the Toxic Substances Control Act?
- A. Anyone may recharge any MVAC system with HFO-1234yf
- B. Commercial users or consumers can only recharge MVAC systems with HFO-1234yf where the original charging with HFO-1234yf was done by the original equipment manufacturer
- C. Only the original equipment manufacturer may ever recharge an HFO-1234yf system
- D. HFO-1234yf may be used to top off a CFC-12 system
Show answer
Answer: B. Commercial users or consumers can only recharge MVAC systems with HFO-1234yf where the original charging with HFO-1234yf was done by the original equipment manufacturer
EPA's comments in the table note that "commercial users or consumers can only recharge MVAC systems with HFO-1234yf where the original charging of the system with HFO-1234yf was done by the original equipment manufacturer." This is a comment pointing to a separate TSCA rule, not one of the SNAP use conditions, and it lets commercial users and consumers recharge such systems, so the option limiting recharging to the original equipment manufacturer is wrong.
Source: eCFR: 40 CFR Part 82, Subpart G, Appendix B (as of Nov 3, 2026)
56. R-152a is acceptable subject to use conditions in new CFC-12 automobile MVAC equipment. Under the Appendix B condition, foreseeable leaks into the passenger compartment must not result in what?
- A. Any measurable R-152a in the engine compartment
- B. R-152a concentrations of 3.7% v/v or above in any part of the free space inside the passenger compartment for more than 15 seconds when the car ignition is on
- C. R-152a concentrations of 10% v/v or above in the trunk for more than one hour
- D. R-152a concentrations of 3.7% v/v or above only while the car is parked with the ignition off
Show answer
Answer: B. R-152a concentrations of 3.7% v/v or above in any part of the free space inside the passenger compartment for more than 15 seconds when the car ignition is on
The condition requires engineering strategies and/or devices so that leaks "do not result in R-152a concentrations of 3.7% v/v or above in any part of the free space" inside the passenger compartment "for more than 15 seconds when the car ignition is on." The limit applies while the ignition is on, not while it is off. This condition is a design requirement for the vehicle system.
Source: eCFR: 40 CFR Part 82, Subpart G, Appendix B (as of Nov 3, 2026)
57. Under Appendix D, SNAP submissions for MVAC refrigerants must include fitting specifications, samples of all fittings and the detailed label, or the submission is considered incomplete. What does the appendix say about a substitute whose submission is incomplete?
- A. It becomes acceptable automatically 90 days after it is submitted
- B. It may be sold, but not used, while EPA reviews it
- C. It may be used in retrofitted systems only
- D. It may not be sold or used, regardless of other acceptability determinations
Show answer
Answer: D. It may not be sold or used, regardless of other acceptability determinations
"Under section 612 of the Clean Air Act, substitutes for which submissions are incomplete may not be sold or used, regardless of other acceptability determinations." The sale prohibition "will not end until 90 days after EPA determines the submission is complete," not 90 days after submission.
Source: eCFR: 40 CFR Part 82, Subpart G, Appendix D (as of Nov 3, 2026)
58. Under the Appendix D use conditions for CFC-12 substitutes in MVACs, what must systems have to prevent discharge of refrigerant to the atmosphere?
- A. A refrigerant identifier built into the service port
- B. A sight glass on the receiver-drier
- C. A second pressure relief valve that vents into the engine compartment
- D. A device to limit compressor operation before the pressure relief device will vent refrigerant
Show answer
Answer: D. A device to limit compressor operation before the pressure relief device will vent refrigerant
"In order to prevent discharge of refrigerant to the atmosphere, systems shall have a device to limit compressor operation before the pressure relief device will vent refrigerant." The aim is to stop the compressor before the relief device releases refrigerant.
Source: eCFR: 40 CFR Part 82, Subpart G, Appendix D (as of Nov 3, 2026)
Prohibitions
59. Under 40 CFR 82.172, what are "use restrictions" on a substitute?
- A. Limits on the price at which a substitute may be sold
- B. Rules on who may take the technician certification test
- C. Recordkeeping rules for shops that buy refrigerant in containers under 20 pounds
- D. Conditions on how the substitute can be used across a sector end-use, or limits on the end-uses or specific applications where it can be used within a sector
Show answer
Answer: D. Conditions on how the substitute can be used across a sector end-use, or limits on the end-uses or specific applications where it can be used within a sector
The rule defines use restrictions as restrictions imposing "either conditions on how the substitute can be used across a sector end-use or limits on the end-uses or specific applications where it can be used within a sector." The definition says nothing about price, testing or small-container sales records.
Source: eCFR: 40 CFR 82.172, Definitions (as of Nov 3, 2026)
60. EPA has listed a substitute as acceptable subject to use restrictions, and the rulemaking imposing them is in effect. What does 40 CFR 82.174(c) require of any person who uses that substitute?
- A. Notify EPA within 90 days after first using it
- B. Get the vehicle owner's written consent before using it
- C. Adhere to any use restrictions set by the acceptability decision
- D. Nothing, because use restrictions bind only the company that produces the substitute
Show answer
Answer: C. Adhere to any use restrictions set by the acceptability decision
Section 82.174(c) says "No person may use a substitute without adhering to any use restrictions set by the acceptability decision" after the effective date of the rulemaking. It applies to any person who uses the substitute, so it is wrong to say only the producer is bound.
Source: eCFR: 40 CFR 82.174, Prohibitions (as of Nov 3, 2026)
61. A rulemaking adds a substitute to the list of unacceptable substitutes. Under 40 CFR 82.174(d), when does the ban on using it apply?
- A. Only after the person's current supply of the substitute runs out
- B. After the effective date of the rulemaking adding it to the list
- C. Only to people who bought the substitute after the listing
- D. Only to the substitute's producer, not to the people who use it
Show answer
Answer: B. After the effective date of the rulemaking adding it to the list
Section 82.174(d) says "No person may use a substitute after the effective date of any rulemaking adding such substitute to the list of unacceptable substitutes." The rule contains no exception for existing supply or earlier purchases.
Source: eCFR: 40 CFR 82.174, Prohibitions (as of Nov 3, 2026)
62. A shop is offered a substitute refrigerant that it has reason to know was imported in violation of the Subpart G regulations. What does 40 CFR 82.174(b) say?
- A. The shop may not use it
- B. The shop may use it as long as it does not resell it
- C. The shop may use it if it pays the import duty
- D. The shop may use it until EPA sends a warning letter
Show answer
Answer: A. The shop may not use it
Section 82.174(b) says "No person may use a substitute which a person knows or has reason to know was manufactured, processed or imported in violation of the regulations in this subpart." The rule offers no exception for paying duties, not reselling, or waiting for a warning.
Source: eCFR: 40 CFR 82.174, Prohibitions (as of Nov 3, 2026)
63. In Appendix B, which flammable substitutes are listed as unacceptable for CFC-12 motor vehicle air conditioners (retrofit and new equipment)?
- A. Flammable substitutes other than R-152a or HFO-1234yf in new equipment
- B. R-152a and HFO-1234yf in new equipment
- C. Only flammable substitutes sold in cans under 20 pounds
- D. Only flammable substitutes used by uncertified persons
Show answer
Answer: A. Flammable substitutes other than R-152a or HFO-1234yf in new equipment
The table lists "Flammable Substitutes, other than R-152a or HFO-1234yf in new equipment" as "Unacceptable." EPA's comments in the table note that R-152a and HFO-1234yf "may be used in new equipment with the use conditions in appendix B," so listing them as unacceptable is wrong.
Source: eCFR: 40 CFR Part 82, Subpart G, Appendix B (as of Nov 3, 2026)
64. Appendix B lists Hydrocarbon Blend B as unacceptable in CFC-12 motor vehicle air conditioners (retrofit and new equipment). What reason do EPA's comments in the table give?
- A. It contains R-c318, a PFC with an extremely high GWP and lifetime
- B. It contains HCFCs that deplete the ozone layer
- C. Flammability is a serious concern, and data have not been submitted to show it can be used safely in this end-use
- D. It requires recovery equipment that does not exist
Show answer
Answer: C. Flammability is a serious concern, and data have not been submitted to show it can be used safely in this end-use
For Hydrocarbon Blend B, EPA's comment says "Flammability is a serious concern. Data have not been submitted to demonstrate it can be used safely in this end-use." The PFC (R-c318) reason is the comment for a different entry, R-405A.
Source: eCFR: 40 CFR Part 82, Subpart G, Appendix B (as of Nov 3, 2026)
65. A shop wants to use a CFC-12 substitute in MVACs with fittings designed by a third-party parts maker, not by the refrigerant's manufacturer. The fittings differ from those used with every other refrigerant. Under Appendix D, may it?
- A. No; using a refrigerant with a fitting designed by anyone other than the refrigerant's manufacturer violates the use condition
- B. Yes, because the fittings are unique to that refrigerant
- C. Yes, if a certified technician installs them
- D. Yes, if the fittings are used only on the shop's own equipment
Show answer
Answer: A. No; using a refrigerant with a fitting designed by anyone other than the refrigerant's manufacturer violates the use condition
A refrigerant may only be used with fittings "specifically intended for that refrigerant and designed by the manufacturer of the refrigerant." "Using a refrigerant with a fitting designed by anyone else, even if it is different from fittings used with other refrigerants, is a violation of this use condition."
Source: eCFR: 40 CFR Part 82, Subpart G, Appendix D (as of Nov 3, 2026)
Fittings and labels
66. In the Appendix B HFO-1234yf use conditions (as of June 3, 2022), the use fitting with a 0.5-inch diameter, 16 threads per inch and a left thread direction is specified for connections with which containers?
- A. Recovery cylinders on CFC-12 recycling equipment
- B. CO2 refrigerant service containers
- C. Small refrigerant cans for consumer or professional use
- D. Containers of HFC-134a used to retrofit CFC-12 systems
Show answer
Answer: C. Small refrigerant cans for consumer or professional use
The condition reads: "For connections with small refrigerant cans for consumer or professional use, use fittings must have a diameter of 0.5 inches, a thread pitch of 16 thread per inch, and a left thread direction, consistent with SAE J2844." For containers used in professional servicing, a separate sentence says use fittings "must be consistent with SAE J2844," and CO2 service containers get a right-hand thread in the CO2 entry.
Source: eCFR: 40 CFR Part 82, Subpart G, Appendix B (as of Nov 3, 2026)
67. As of June 3, 2022, HFO-1234yf MVAC systems must adhere to all of the safety requirements of SAE J639. Which item does the Appendix B condition name among those requirements?
- A. A flammable refrigerant warning label
- B. A refrigerant identifier built into each service port
- C. A sight glass on the receiver-drier
- D. A 5-pound maximum system charge
Show answer
Answer: A. A flammable refrigerant warning label
The condition says the systems must meet SAE J639 "including requirements for a flammable refrigerant warning label, high-pressure compressor cutoff switch and pressure relief devices, and unique fittings." None of the other options is named in the condition.
Source: eCFR: 40 CFR Part 82, Subpart G, Appendix B (as of Nov 3, 2026)
68. Under the HFO-1234yf use conditions in Appendix B (as of June 3, 2022), use fittings for connections with refrigerant containers for professional servicing must be consistent with which SAE standard?
- A. SAE J1739
- B. SAE J2844
- C. SAE J2773
- D. SAE J1052
Show answer
Answer: B. SAE J2844
The condition says that for containers "for use in professional servicing, use fittings must be consistent with SAE J2844." SAE J1739 is the standard the conditions name for manufacturers' Failure Mode and Effect Analysis (FMEA), not for container fittings.
Source: eCFR: 40 CFR Part 82, Subpart G, Appendix B (as of Nov 3, 2026)
69. For R-152a in new CFC-12 automobile MVAC equipment, Appendix B says manufacturers must adhere to all the safety requirements of SAE Standard J639 (adopted 2011). Which items does the condition say those requirements include?
- A. A high pressure system warning label and right-hand thread fittings
- B. Barrier hoses and an "ozone depleter" label
- C. A label with the technician's name and the date of the retrofit
- D. Unique fittings and a flammable refrigerant warning label
Show answer
Answer: D. Unique fittings and a flammable refrigerant warning label
The R-152a condition names SAE J639 "including unique fittings and a flammable refrigerant warning label," as well as SAE Standard J2773. The high pressure system warning label is named in the CO2 entry, and the technician-name label is an Appendix D retrofit condition.
Source: eCFR: 40 CFR Part 82, Subpart G, Appendix B (as of Nov 3, 2026)
70. Appendix B lists carbon dioxide (CO2) as acceptable subject to use conditions in new CFC-12 motor vehicle air conditioning equipment. Which label does the condition list by name?
- A. A flammable refrigerant warning label
- B. A high pressure system warning label
- C. An "ozone depleter" label
- D. A label with the price of the refrigerant charge
Show answer
Answer: B. A high pressure system warning label
The CO2 condition says its use must follow SAE J639 (2011 version) "including: Installation of a high pressure system warning label; Installation of a compressor cut-off switch" and unique fittings. The flammable refrigerant warning label is named in the R-152a and HFO-1234yf entries, not in the CO2 entry.
Source: eCFR: 40 CFR Part 82, Subpart G, Appendix B (as of Nov 3, 2026)
71. Under the Appendix B use conditions for CO2 in new motor vehicle air conditioning equipment, what thread direction must the unique fitting for CO2 refrigerant service containers have?
- A. Left-hand thread direction
- B. Right-hand thread direction
- C. Either direction, as long as the thread pitch differs from CFC-12
- D. No thread; only quick-connect fittings are allowed
Show answer
Answer: B. Right-hand thread direction
The condition calls for an outside diameter of 20.955 mm (0.825 inches) "and righthand thread direction for CO2 refrigerant service containers." A table footnote adds that this container fitting requirement applies only to service containers used during MVAC servicing; the left thread direction is the HFO-1234yf small-can requirement.
Source: eCFR: 40 CFR Part 82, Subpart G, Appendix B (as of Nov 3, 2026)
72. Under the Appendix D use conditions, an existing CFC-12 service port is retrofitted with a conversion assembly. How must the assembly attach to the CFC-12 fitting?
- A. Hand-tightened only, so it can be taken off if CFC-12 service is needed later
- B. Through an adapter, so either refrigerant's equipment can connect
- C. With a thread lock adhesive and/or a separate mechanical latching mechanism, in a manner that permanently prevents the assembly from being removed
- D. With a push-on plastic cap over the old port
Show answer
Answer: C. With a thread lock adhesive and/or a separate mechanical latching mechanism, in a manner that permanently prevents the assembly from being removed
"When existing CFC-12 service ports are retrofitted, conversion assemblies shall attach to the CFC-12 fitting with a thread lock adhesive and/or a separate mechanical latching mechanism in a manner that permanently prevents the assembly from being removed." The appendix also says "Using an adapter or deliberately modifying a fitting to use a different refrigerant is a violation of this use condition."
Source: eCFR: 40 CFR Part 82, Subpart G, Appendix D (as of Nov 3, 2026)
73. After a retrofit under Appendix D, some information about the previous refrigerant on the air conditioning system cannot be covered by the new label. What must be done with that information?
- A. Leave it readable so later technicians know the system's history
- B. Cover it with a removable sticker
- C. Nothing, as long as the new label has a different background color
- D. Render it permanently unreadable
Show answer
Answer: D. Render it permanently unreadable
"Information on the previous refrigerant that cannot be covered by the new label must be rendered permanently unreadable." The label itself "must be affixed to the system over information related to the previous refrigerant, in a location not normally replaced during vehicle repair."
Source: eCFR: 40 CFR Part 82, Subpart G, Appendix D (as of Nov 3, 2026)
74. Under Appendix D, a vehicle is retrofitted to a refrigerant that displays flammability limits as measured according to ASTM E681. Which statement must the retrofit label carry for that reason?
- A. No statement, because flammability is shown only by the label color
- B. "Caution—Should Be Operated By Qualified Personnel"
- C. "High pressure system"
- D. "This refrigerant is FLAMMABLE. Take appropriate precautions."
Show answer
Answer: D. "This refrigerant is FLAMMABLE. Take appropriate precautions."
If the refrigerant "displays flammability limits as measured according to ASTM E681," the label must carry the statement "This refrigerant is FLAMMABLE. Take appropriate precautions."
Source: eCFR: 40 CFR Part 82, Subpart G, Appendix D (as of Nov 3, 2026)
75. Under Appendix H's criteria for unique fittings for alternative motor vehicle refrigerants, what makes two screw-on fittings "differ"?
- A. Only the thread pitch is changed
- B. The diameter differs by at least 1/16 inch, or the thread direction is reversed
- C. The fittings are a different color
- D. The fittings come from different manufacturers
Show answer
Answer: B. The diameter differs by at least 1/16 inch, or the thread direction is reversed
For screw-on fittings, "differ" means "either the diameter must differ by at least 1⁄16 inch or the thread direction must be reversed." The rule says "Simply changing the thread pitch is not sufficient."
Source: eCFR: 40 CFR Part 82, Subpart G, Appendix H (as of Nov 3, 2026)