CFC Automotive Air Conditioning Service 2 — Questions and Answers
Question 1: Which EPA section requires technicians who service motor vehicle air conditioners to be certified?
- Section 608
- Section 609 (Correct answer)
- Section 611
- Section 602
Correct answer: Section 609
EPA Section 609 specifically regulates the servicing of motor vehicle air conditioners and requires technician certification.
Question 2: When recovering refrigerant from a vehicle with a small refrigerant charge (less than 200 grams), what is the minimum required recovery efficiency?
- 80%
- 85%
- 90% (Correct answer)
- 95%
Correct answer: 90%
For systems with less than 200 grams of refrigerant, recovery equipment must achieve at least 90% efficiency.
Question 3: A vehicle A/C system low-side gauge reads 10 psi and the high-side reads 100 psi with R-134a. What does this most likely indicate?
- Normal operation
- Overcharge of refrigerant
- Low refrigerant charge or compressor failure (Correct answer)
- Clogged condenser
Correct answer: Low refrigerant charge or compressor failure
Both abnormally low pressures on high and low sides indicate either a low refrigerant charge or a non-functioning compressor.
Question 4: What type of oil is used in automotive A/C systems that contain R-1234yf refrigerant?
- Mineral oil
- Alkylbenzene oil
- PAG oil (Correct answer)
- POE oil
Correct answer: PAG oil
PAG (polyalkylene glycol) oil is the correct lubricant for R-1234yf automotive A/C systems.
Question 5: Before opening an automotive A/C system for repairs, the technician must:
- Add dye to locate leaks
- Recover all refrigerant using certified equipment (Correct answer)
- Flush the system with nitrogen
- Replace the receiver-drier
Correct answer: Recover all refrigerant using certified equipment
Federal law requires complete refrigerant recovery using EPA-approved equipment before opening any A/C system.
Question 6: The Global Warming Potential (GWP) of R-1234yf compared to R-134a is approximately:
- Higher — about 1,430
- Similar — about 1,000
- Much lower — about 4 (Correct answer)
- Zero — it has no warming potential
Correct answer: Much lower — about 4
R-1234yf has a GWP of approximately 4, far lower than R-134a's GWP of 1,430, making it more environmentally friendly.
Question 7: Which component in an automotive A/C system removes moisture from the refrigerant circuit?
- Expansion valve
- Accumulator or receiver-drier (Correct answer)
- Evaporator
- Condenser
Correct answer: Accumulator or receiver-drier
The accumulator (used with orifice tube systems) or receiver-drier (used with expansion valve systems) contains desiccant to absorb moisture.
CFC Automotive Air Conditioning Service 2
Which EPA section requires technicians who service motor vehicle air conditioners to be certified?