GM GM HVAC and Climate Control

Question 1

What refrigerant is used in most modern GM vehicle HVAC systems produced after 2021?

Accepted Answer

R-1234yf

Answer

R-134a

Answer

R-22

Answer

R-410a

Question 2

Before opening a GM AC system for service, a technician must first perform which step?

Accepted Answer

Recover all refrigerant using a certified recovery machine

Answer

Add fresh refrigerant to top off the system

Answer

Flush the condenser with water

Answer

Replace the receiver-drier before any other step

Question 3

What component in a GM HVAC system is responsible for removing moisture from the refrigerant circuit?

Accepted Answer

Receiver-drier or accumulator

Answer

Expansion valve

Answer

Condenser

Answer

Evaporator core

Question 4

On a GM dual-zone climate control system, what allows each side of the vehicle to maintain independent temperature settings?

Accepted Answer

A blend door actuator for each temperature zone

Answer

Two separate compressors

Answer

A single blower with dual evaporators

Answer

Two separate refrigerant circuits

Question 5

A customer complains their GM vehicle's AC blows cold then warm intermittently. Which component is the most likely cause?

Accepted Answer

Icing of the evaporator core due to a low refrigerant charge

Answer

Faulty blend door actuator

Answer

Failed condenser fan

Answer

Cracked heater core

Question 6

What is the purpose of the orifice tube in a GM AC system that uses this design?

Accepted Answer

Meter refrigerant flow into the evaporator by reducing pressure

Answer

Compress refrigerant vapor before entering the condenser

Answer

Store excess refrigerant during low-demand operation

Answer

Sense evaporator outlet temperature for compressor control