CFC Automotive Air Conditioning Service 3

Question 1

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

Accepted Answer

A refrigerant and oil leak requiring repair

Answer

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

Question 2

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

Accepted Answer

To metering refrigerant flow into the evaporator

Answer

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

Question 3

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

Accepted Answer

Whenever the system is opened for more than 30 minutes

Answer

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.

Question 4

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

Accepted Answer

R-1234yf

Answer

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

Question 5

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

Accepted Answer

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

Answer

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

(CFC) Chlorofluorocarbon Certification Practice Test

(CFC) Chlorofluorocarbon Certification Practice Test

CFC Automotive Air Conditioning Service 3