Exam 54: Heating and Air Conditioning

Most vehicles have a cabin filtration system that cleans the air before it enters the passenger compartment.

Most modern heater cores are made of ____________________ cores with plastic tanks.

Federal safety standards do not require that all motor vehicles be equipped with passenger compartment heating and windshield defrosting systems.

What is the purpose of the thermostatic switch?

Before 1994, most automotive A/C systems used a refrigerant called ____________________.

R-134a is a hydrofluorocarbon.

Most current HVAC systems use electric servomotors to move the various doors.

Technician A says a hybrid vehicle has a large reservoir of liquid refrigerant to keep the passenger compartment cool during long periods when the engine is shut down. Technician B says some hybrid vehicles have electrically driven A/C compressors. Who is correct?

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

The dash-mounted switch and the blower motor ____________________ block are used to control the blower motor speed.

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

On which of the following laws of nature is the air-conditioning system based?

Technician A says R-12 air-conditioning technicians must be certified. Technician B says R-12 air-conditioning equipment must be certified. Who is correct?

The change from a liquid to a vapor is called ____________________.

Which of the following statements is correct?

Which of these statements is true?

What is the purpose of the ambient temperature switch?

R-134a systems are required to be fitted with ____________________ service fittings throughout the system.

Before 1994, most manufacturers used _____ as a refrigerant.

An A/C system cools the air by moving heat from the confined space of the passenger compartment to the engine cooling system.