Exam 54: Heating and Air Conditioning

Heater systems that do not use a heater control valve use a ____________________ door to regulate the heat inside the passenger compartment.

Which of the following may be electrically connected in series with the compressor electromagnetic clutch?

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

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

Technician A says hybrid vehicles use electrically driven high voltage A/C compressors. Technician B says the compressors for hybrids use the same refrigerant oil as regular vehicles. Who is correct?

Technician A repairs a leaking heater core. Technician B replaces a leaking heater core with a new core. Who is correct ?

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

Variable displacement compressors are normally _____ compressors with a pivoting wobble plate.

A sight glass is normally found on systems using R-12 and a(n)_____.

A thermostatic expansion valve is mounted on the outlet side of the evaporator.

Which statement is false?

What does CCOT refer to?

Many late-model A/C systems use variable drive compressors.

The heater core may be plugged if the inlet hose feels hot and the outlet hose feels cool.

Technician A says a CCOT system has an expansion valve and a sight glass. Technician B says a CCOT system has an accumulator. Who is correct?

Heater core and evaporator core temperatures can be easily measured with a ____________________.

Airflow control valves in the ventilation duct work are operated by ______.

What refrigerant is currently slated to replace R134a?

Technician A says the normal operating pressures of R-134a are slightly lower than the pressures of R-12. Technician B says R-134a boils at 134°F.  Who is correct?

Which of the following components is NOT part of a receiver/drier?