ASE Refrigerant Recovery, Recycling, and Handling 3

Question 1

A vehicle A/C system is low on charge with no visible signs of a leak. The BEST next step is to:

Accepted Answer

Inject UV dye and perform a thorough leak search

Answer

UV dye injection followed by a UV light inspection is an effective method for finding slow or small leaks that are not visible to the naked eye or detectable when the system is empty.

Question 2

What symptom indicates an OVERCHARGED A/C system?

Accepted Answer

High-side pressure is excessively high with poor cooling output

Answer

An overcharged system has excessive refrigerant that cannot fully condense, causing abnormally high discharge pressure and reduced cooling efficiency.

Question 3

Which SAE standard defines service fittings that prevent cross-contamination between R-134a and R-1234yf systems?

Accepted Answer

SAE J2843

Answer

SAE J2843 specifies unique quick-connect service fittings for R-1234yf systems to prevent accidental charging with R-134a or cross-contamination between the two refrigerant types.

Question 4

During recovery, refrigerant should be recovered from:

Accepted Answer

Both the high side and low side simultaneously using the appropriate connections

Answer

Connecting to both high- and low-side service ports speeds recovery and ensures complete removal of refrigerant from both sides of the system.

Question 5

What is the FIRST action a technician should take when an A/C system pressure remains elevated after recovery appears complete?

Accepted Answer

Allow the system to cool and attempt a second recovery cycle

Answer

Residual pressure after recovery often means refrigerant is still boiling off; allowing the system to cool and running a second recovery cycle removes additional refrigerant that was in liquid form.

ASE Practice Test

ASE Practice Test

ASE Refrigerant Recovery, Recycling, and Handling 3