Question 1

R-134a refrigerant

Accepted Answer

Commonly used in automotive air conditioning systems as a replacement for R-12.

Question 2

HVAC system

Accepted Answer

Acronym for Heating, Ventilation, and Air Conditioning system found in vehicles.

Question 3

Evaporator

Accepted Answer

Part of the HVAC system where liquid refrigerant absorbs heat from the air.

Question 4

Condenser

Accepted Answer

Component that removes heat from the refrigerant, converting it from a gas to a liquid.

Question 5

Receiver/dryer

Accepted Answer

Device that filters and dries the refrigerant before it enters the expansion valve.

Question 6

Expansion valve

Accepted Answer

Regulates the flow of refrigerant into the evaporator, controlling the cooling process.

Question 7

Compressor

Accepted Answer

Mechanical device that pressurizes the refrigerant, increasing its temperature and pressure.

Question 8

Clutch cycling switch

Accepted Answer

Controls the operation of the compressor clutch based on system pressure.

Question 9

Orifice tube

Accepted Answer

Restriction device located between the condenser and the evaporator.

Question 10

High-pressure switch

Accepted Answer

Cuts off power to the compressor when the system pressure exceeds a certain level.

Question 11

Low-pressure switch

Accepted Answer

Disables the compressor when the system pressure drops below a specified level.

Question 12

Blend door actuator

Accepted Answer

Controls the direction and temperature of airflow within the HVAC system.

Question 13

Cabin air filter

Accepted Answer

Removes dust, pollen, and other contaminants from the air entering the passenger compartment.

Question 14

Heater core

Accepted Answer

Component that uses engine coolant to provide heat to the passenger compartment.

Question 15

A/C system leak detection

Accepted Answer

Methods and tools used to identify refrigerant leaks in the HVAC system.

Question 16

A/C system evacuation

Accepted Answer

Process of removing air and moisture from the refrigerant system before recharging.

Question 17

A/C system recharge

Accepted Answer

Adding the correct amount of refrigerant to the system to restore proper cooling.

Question 18

A/C system diagnostics

Accepted Answer

Techniques for troubleshooting and identifying issues within the HVAC system.

Question 19

Pressure gauges

Accepted Answer

Instruments used to measure the pressure of the refrigerant within the A/C system.

Question 20

Temperature sensors

Accepted Answer

Devices that monitor and provide input on the temperature within the HVAC system.

Question 21

A/C compressor clutch

Accepted Answer

Electromagnetic device that engages and disengages the compressor from the engine.

Question 22

HVAC control module

Accepted Answer

Electronic module that regulates and controls the operation of the HVAC system.

Question 23

Heater control valve

Accepted Answer

Controls the flow of coolant to the heater core, regulating the cabin temperature.

Question 24

High-side pressure

Accepted Answer

The pressure of the refrigerant in the high-pressure side of the A/C system.

Question 25

Low-side pressure

Accepted Answer

The pressure of the refrigerant in the low-pressure side of the A/C system.

Question 26

A/C system retrofit

Accepted Answer

Modifying an older A/C system to accommodate a newer refrigerant, such as R-134a.

Question 27

A/C system capacity

Accepted Answer

The amount of refrigerant required for optimal performance of the A/C system.

Question 28

A/C system evacuation pump

Accepted Answer

Tool used to remove air and moisture from the A/C system during service.

Question 29

Blower motor

Accepted Answer

Electric motor that powers the fan to circulate air within the HVAC system.

Question 30

Heater control panel

Accepted Answer

Interface that allows the driver to adjust the settings of the HVAC system.

Question 31

A/C compressor clutch relay

Accepted Answer

Electrical device that controls the engagement of the compressor clutch.

Question 32

HVAC system mode doors

Accepted Answer

Mechanisms that control the direction of airflow within the HVAC system.

Question 33

Heater valve cable

Accepted Answer

Cable used to control the opening and closing of the heater control valve.

Question 34

HVAC system airflow calibration

Accepted Answer

Process of adjusting the airflow to ensure proper distribution within the vehicle.

Question 35

Ambient temperature sensor

Accepted Answer

Sensor that measures the temperature of the air surrounding the vehicle.

Question 36

High-pressure relief valve

Accepted Answer

Safety valve that releases excess pressure in the A/C system to prevent damage.

Question 37

A/C system retrofit adapter

Accepted Answer

Fitting or adapter used to convert the fittings on an older A/C system to accommodate a newer refrigerant.

Question 38

Heater core flush

Accepted Answer

Process of cleaning out debris and contaminants from the heater core to improve heating performance.

Question 39

A/C system leak repair

Accepted Answer

Procedures and techniques for fixing refrigerant leaks in the HVAC system.

Question 40

A/C system pressure testing

Accepted Answer

Testing the system's pressure to identify potential leaks or issues.

Question 41

HVAC system blower resistor

Accepted Answer

Component that controls the speed of the blower motor in different fan settings.

Question 42

A/C system temperature control

Accepted Answer

Mechanisms and sensors that regulate the temperature output of the HVAC system.

Question 43

A/C system performance testing

Accepted Answer

Evaluating the cooling capacity and efficiency of the A/C system.

Question 44

HVAC system mode control

Accepted Answer

Controls and switches that allow the driver to select various airflow modes (vent, defrost, floor, etc.).

Question 45

A/C system electrical troubleshooting

Accepted Answer

Diagnostic procedures for identifying and resolving electrical issues in the HVAC system.

Question 46

A/C system compressor clutch coil

Accepted Answer

Electromagnetic coil that engages the compressor clutch when energized.

Question 47

A/C system refrigerant recovery

Accepted Answer

Process of removing refrigerant from the system for storage or disposal.

Question 48

A/C system vacuum testing

Accepted Answer

Checking the integrity of the A/C system by creating a vacuum and monitoring for pressure loss.

Question 49

HVAC system blend door calibration

Accepted Answer

Adjusting the blend door positions to ensure accurate temperature control.

Question 50

A/C system pressure sensor

Accepted Answer

Sensor that measures the pressure of the refrigerant within the A/C system.

Question 51

A/C system evaporator core

Accepted Answer

Heat exchanger that removes heat from the air by evaporating the refrigerant.

Question 52

A/C system accumulator

Accepted Answer

Storage device that collects and stores liquid refrigerant and removes moisture.

Question 53

A/C system compressor clutch cycling relay

Accepted Answer

Relay that controls the engagement and disengagement of the compressor clutch.

Question 54

HVAC system mode door actuator

Accepted Answer

Actuator that controls the movement of the mode doors to direct airflow.

Question 55

A/C system temperature blend door actuator

Accepted Answer

Actuator that controls the position of the temperature blend door.

Question 56

A/C system pressure relief valve

Accepted Answer

Safety valve that releases excess pressure to prevent damage to the A/C system.

Question 57

HVAC system control panel illumination

Accepted Answer

Lighting system that illuminates the control panel for visibility.

Question 58

A/C system expansion valve orifice

Accepted Answer

Small opening within the expansion valve that regulates refrigerant flow.

Question 59

A/C system discharge air temperature sensor

Accepted Answer

Sensor that measures the temperature of the air exiting the HVAC system.

Question 60

A/C system suction line

Accepted Answer

Pipe or hose that carries low-pressure refrigerant vapor from the evaporator to the compressor.

Question 61

HVAC system recirculation mode

Accepted Answer

Setting that recirculates the cabin air rather than drawing in outside air.

Question 62

A/C system pressure transducer

Accepted Answer

Device that converts refrigerant pressure into an electrical signal for the HVAC system.

Question 63

HVAC system vacuum pump

Accepted Answer

Tool used to create a vacuum in the A/C system for testing and service procedures.

Question 64

A/C system cooling fan

Accepted Answer

Electric fan that helps dissipate heat from the condenser when the vehicle is stationary or at low speeds.

ASE A7 Heating & Air Conditioning Flashcard Set