ASE ASE Heating & Air Conditioning 2

Question 1

What is the purpose of the orifice tube in an automotive A/C system?

Accepted Answer

Meters refrigerant flow into the evaporator

Answer

Filters moisture from refrigerant

Answer

Compresses refrigerant vapor

Answer

Stores refrigerant charge

Question 2

A heater core that leaks coolant into the passenger compartment will MOST likely cause which symptom?

Accepted Answer

Sweet smell and fogged windows

Answer

Overheating engine

Answer

Low coolant pressure

Answer

No heat output only

Question 3

What does a high reading on both the high-side and low-side A/C gauges MOST likely indicate?

Accepted Answer

Blocked or restricted condenser

Answer

Refrigerant undercharge

Answer

Stuck-open expansion valve

Answer

Faulty compressor

Question 4

Which component controls the blend of heated and cooled air entering the passenger cabin in a dual-zone climate system?

Accepted Answer

Blend door actuator

Answer

Blower motor resistor

Answer

Recirculation door

Answer

Evaporator temperature sensor

Question 5

What is the correct procedure before adding refrigerant to an A/C system that has been opened for repair?

Accepted Answer

Evacuate the system with a vacuum pump to remove moisture and air

Answer

Charge with refrigerant immediately

Answer

Flush with nitrogen only

Answer

Run the engine to purge lines

Question 6

Which sensor signal does the ECM primarily use to cycle the A/C compressor clutch on and off to protect the system?

Accepted Answer

A/C pressure transducer

Answer

Ambient temperature sensor

Answer

Evaporator outlet temperature sensor

Answer

Engine coolant temperature sensor