Exam 54: Heating and Air Conditioning

The purpose of the desiccant bag in a receiver/drier or accumulator is to ______.

____________________ heat is the amount of heat necessary to change the state of a substance.

Technician A says the receiver/drier is located on the low [pressure] side of the A/C system. Technician B says the accumulator is located on the low side of the system. Who is correct?

Technician A says hybrid vehicles have an electric water pump to circulate coolant through the heater core when the engine is stopped. Technician B says hybrid vehicles have a hot coolant storage tank to provide heat for the passenger compartment when the engine is shut down. Who is correct?

Section 609 of the U.S. Clean Air Act of 1990 requires that all service technicians who work on A/C systems must be certified in proper refrigerant recovery and recycling.

Describe the function of a cycling clutch in an air-conditioning system.

When the air-conditioning is set to the maximum position, passenger compartment air is ____________________.

The refrigerant is at its lowest pressure and temperature at the ______.

____________________ valves are used to seal the compressor inlet and outlet ports.

What is the function of the potentiometer in the HVAC servomotor assembly?

Which of the following statements concerning evaporators is NOT true?

____________________ may also be referred to as SUVA.

If little or no resistance is felt while operating the temperature control lever, the problem is most likely which of the following?

All materials or substances, as cold as ______, have heat in them.

Heater cores with electric PTC heater strips are used on what type of vehicle?

What does CCOT refer to?

PAG oil works well with R-12 refrigerant.

Air-conditioning systems that use an accumulator come equipped with a sight glass.

Thermal expansion valves are being discussed. Technician A says the TEV regulates the refrigerant flow to the evaporator by balancing the inlet flow to the outlet temperature. Technician B says the TEV is closed when the temperature at the outlet of the evaporator is high. Who is correct?

The supply of outside air that flows through the ventilation system inlet grille when the car is moving is called ____________________ air.