Air Conditioning Repair Car Air Conditioning Repair 2

Question 1

What tool is required to safely recover refrigerant from a car AC system before opening it for repair?

Accepted Answer

Refrigerant recovery machine

Answer

A refrigerant recovery machine captures refrigerant from the system into a certified recovery cylinder, which is legally required before any AC repair that opens the system.

Question 2

A car's AC blows cold for 10 minutes then gradually turns warm. What is the most likely cause?

Accepted Answer

Icing of the evaporator due to low refrigerant

Answer

Low refrigerant causes the evaporator coil to drop below freezing, forming ice that blocks airflow; once the ice melts, cooling briefly returns before icing again.

Question 3

Which component in a car AC system is responsible for removing moisture from the refrigerant?

Accepted Answer

Receiver-drier

Answer

The receiver-drier contains desiccant material that absorbs moisture from the refrigerant, preventing ice formation and acid contamination.

Question 4

What does a high-side pressure reading significantly above normal indicate during AC diagnosis?

Accepted Answer

Restricted or failing condenser

Answer

Abnormally high discharge-side pressure typically points to poor condenser airflow, a dirty condenser coil, or a failing condenser fan that prevents heat rejection.

Question 5

When leak-testing a car AC system after repair, which method is preferred for locating small leaks?

Accepted Answer

Inject UV dye then use a UV lamp

Answer

UV dye injection followed by UV lamp inspection is a precise, widely accepted method that visually highlights even small leak points without risk of contaminating a dry system.

Air Conditioning Repair Practice Test

Air Conditioning Repair Practice Test

Air Conditioning Repair Car Air Conditioning Repair 2