CFC Automotive Air Conditioning Service 5

Question 1

Why is nitrogen used to leak-test an automotive A/C system after repair rather than refrigerant?

Accepted Answer

Nitrogen is cheaper and will not release ODS if the test reveals additional leaks

Answer

Using nitrogen for pressure testing prevents refrigerant release if additional leaks are found, and nitrogen is inert and inexpensive.

Question 2

A vehicle owner asks if they can purchase R-134a in cans smaller than 2 lbs to top off their own car's A/C. Under current EPA rules:

Accepted Answer

Small cans under 2 lbs were restricted for sale to uncertified consumers starting in 2018

Answer

EPA regulations effective January 2018 restrict the sale of small refrigerant containers (under 2 lbs) of R-134a and substitute refrigerants to Section 609-certified technicians only.

Question 3

When recharging an automotive A/C system, the technician should charge by:

Accepted Answer

Weight using a calibrated refrigerant scale to the manufacturer's specified charge

Answer

Charging by weight to the manufacturer's specification is the most accurate method and prevents both undercharge and overcharge.

Question 4

Which organization certifies technicians under EPA Section 609 through an approved certification program?

Accepted Answer

Refrigerant testing organizations approved by the EPA, such as MACS or ASE

Answer

EPA-approved certifying organizations such as MACS Worldwide and ASE administer the Section 609 certification exams.

Question 5

An evaporator core is found to be leaking. After recovery and repair, the system should be evacuated to at least:

Accepted Answer

500 microns

Answer

Best practice after opening an automotive A/C system for repair is to evacuate to 500 microns or lower to ensure all moisture and non-condensables are removed.

(CFC) Chlorofluorocarbon Certification Practice Test

(CFC) Chlorofluorocarbon Certification Practice Test

CFC Automotive Air Conditioning Service 5