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Automotive Air Conditioning Service Flashcards

7 cards from real CFC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Automotive Air Conditioning Service flashcards as text

  1. A technician notices oil streaks near the compressor shaft seal of an R-134a system. This most likely indicates:

    Answer: A refrigerant and oil leak requiring repair

    Oil streaks at the compressor shaft seal indicate refrigerant is escaping along with compressor oil, requiring seal replacement.

  2. What is the purpose of the orifice tube in an automotive A/C system?

    Answer: To metering refrigerant flow into the evaporator

    The orifice tube is a fixed metering device that restricts refrigerant flow into the evaporator, causing pressure drop and cooling.

  3. When should a technician replace the receiver-drier or accumulator?

    Answer: Whenever the system is opened for more than 30 minutes

    The desiccant in receiver-driers and accumulators absorbs moisture from the air when the system is opened, so replacement is recommended whenever the system is opened for an extended period.

  4. Which refrigerant is classified as an HFO (hydrofluoroolefin) and is approved for use in new automotive A/C systems?

    Answer: R-1234yf

    R-1234yf is an HFO refrigerant with a very low GWP that has largely replaced R-134a in new vehicles since 2014.

  5. A technician uses refrigerant identifier equipment before servicing a vehicle A/C. The identifier shows 5% air contamination. The technician should:

    Answer: Recover the refrigerant into a separate dedicated cylinder and not mix it with pure refrigerant

    Contaminated refrigerant must be recovered into a dedicated cylinder and sent to a reclaimer — it cannot be mixed with pure refrigerant.

  6. Which condition would cause an automotive A/C system to have high pressure on both high and low sides?

    Answer: Refrigerant overcharge or condenser airflow restriction

    High pressures on both sides indicate too much refrigerant in the system or insufficient heat rejection at the condenser.

  7. Under EPA Section 609, records of refrigerant purchases for MVAC service must be kept for:

    Answer: 3 years

    EPA Section 609 requires technicians and shops to keep records of refrigerant purchases for a minimum of three years.