ASE Refrigerant Recovery, Recycling, and Handling

Question 1

Which refrigerant has largely replaced R-134a in newer vehicle A/C systems due to its lower global warming potential?

Accepted Answer

R-1234yf

Answer

R-1234yf (HFO-1234yf) replaced R-134a in many newer vehicles because it has a GWP of less than 1 compared to R-134a's GWP of 1,430.

Question 2

What federal regulation requires technicians to be certified before purchasing or handling refrigerants used in motor vehicle air conditioning?

Accepted Answer

EPA Section 609

Answer

EPA Section 609 of the Clean Air Act specifically covers technician certification and equipment standards for servicing motor vehicle air conditioning systems.

Question 3

Before opening a vehicle A/C system for service, the technician MUST first:

Accepted Answer

Recover all refrigerant using approved equipment

Answer

EPA regulations prohibit venting refrigerants into the atmosphere; all refrigerant must be recovered with approved equipment before opening the system.

Question 4

A refrigerant identifier displays contamination in a sample recovered from a vehicle. The technician should:

Accepted Answer

Store it in a dedicated contaminated refrigerant cylinder and send it to a reclaimer

Answer

Contaminated refrigerant must be stored separately in a dedicated cylinder labeled for contaminated refrigerant and sent to a certified reclaimer; venting is never permitted.

Question 5

What color is used to identify the HIGH-SIDE hose on a standard A/C manifold gauge set?

Accepted Answer

Red

Answer

The high-side hose is red, the low-side hose is blue, and the center utility hose is yellow — this is the standard industry color coding.

ASE Practice Test

ASE Practice Test

ASE Refrigerant Recovery, Recycling, and Handling