Exam 54: Heating and Air Conditioning

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Technician A says in most cases, problems with the heating system are problems with the engine's cooling system. Technician B says a restricted heater return hose can cause excess heat in the passenger compartment. Who is correct?

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Question 1

Correct Answer:

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What are barrier hoses?

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Question 2

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Barrier hoses have an additional layer of rubber that serves as a barrier to prevent refrigerant from escaping through the pores of the hose. Barrier hoses are required on systems that use R-134a refrigerant.

Why does condensed water drip from the air-conditioning system?

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Question 3

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The evaporator cools (removes heat from) the incoming air and moisture in the air condenses and is allowed to drop from the vehicle in the form of water.

Technician A says refrigerant leaves the compressor as a high-pressure liquid. Technician B says the condenser changes the high-pressure liquid refrigerant into a high-pressure vapor. Who is correct?

(Multiple Choice)

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Question 4

The blower motor does not run in any fan switch position. A check with a DMM reveals that power is getting to the motor. Technician A says the motor ground is bad. Technician B says the motor is burned out. Who is correct?

(Multiple Choice)

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Question 5

Heater control valves are operated by a ______.

(Multiple Choice)

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Question 6

Aluminum tubing is often used to connect air-conditioning components where flexibility is not required.

(True/False)

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Question 7

Technician A says an A/C system using CO₂ [carbon dioxide] for a refrigerant will not contribute to global warming and is environmentally friendly. Technician B says CO₂ refrigerant does not need to be recovered and recycled. Who is correct?

(Multiple Choice)

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Question 8

What tool would you use to check the operation of a vacuum motor?

(Essay)

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Question 9

Which of the following oils can be used in an R-134a system?

(Multiple Choice)

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Question 10

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 degrees Fahrenheit. Who is correct?

(Multiple Choice)

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Question 11

Which of the following statements is NOT correct?

(Multiple Choice)

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Question 12

The heater core is part of the engine's ____________________ system.

(Short Answer)

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Question 13

The ____________________ displacement compressor automatically changes volume and the amount of refrigerant flow.

(Short Answer)

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Question 14

A heating system includes all the following parts EXCEPT:

(Multiple Choice)

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Question 15

The evaporator is located _____.

(Multiple Choice)

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Question 16

When the ____________________ door is closed, outside air is blocked from entering the ventilation system while air from the interior of the vehicle is drawn into the heater blower.

(Short Answer)

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Question 17

A subcooler is located ______.

(Multiple Choice)

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Question 18

The largest and coolest line/hose in the A/C system is the ______ line.

(Multiple Choice)

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Question 19

What is an automatic temperature control [ATC] system?

(Essay)

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Question 20

Showing 1 - 20 of 105

Exam 54: Heating and Air Conditioning

Technician A says in most cases, problems with the heating system are problems with the engine's cooling system. Technician B says a restricted heater return hose can cause excess heat in the passenger compartment. Who is correct?

What are barrier hoses?

Why does condensed water drip from the air-conditioning system?

Technician A says refrigerant leaves the compressor as a high-pressure liquid. Technician B says the condenser changes the high-pressure liquid refrigerant into a high-pressure vapor. Who is correct?

The blower motor does not run in any fan switch position. A check with a DMM reveals that power is getting to the motor. Technician A says the motor ground is bad. Technician B says the motor is burned out. Who is correct?

Heater control valves are operated by a ______.

Aluminum tubing is often used to connect air-conditioning components where flexibility is not required.

Technician A says an A/C system using CO2 [carbon dioxide] for a refrigerant will not contribute to global warming and is environmentally friendly. Technician B says CO2 refrigerant does not need to be recovered and recycled. Who is correct?

What tool would you use to check the operation of a vacuum motor?

Which of the following oils can be used in an R-134a system?

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 degrees Fahrenheit. Who is correct?

Which of the following statements is NOT correct?

The heater core is part of the engine's ____________________ system.

The ____________________ displacement compressor automatically changes volume and the amount of refrigerant flow.

A heating system includes all the following parts EXCEPT:

The evaporator is located _____.

When the ____________________ door is closed, outside air is blocked from entering the ventilation system while air from the interior of the vehicle is drawn into the heater blower.

A subcooler is located ______.

The largest and coolest line/hose in the A/C system is the ______ line.

What is an automatic temperature control [ATC] system?

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Technician A says an A/C system using CO₂ [carbon dioxide] for a refrigerant will not contribute to global warming and is environmentally friendly. Technician B says CO₂ refrigerant does not need to be recovered and recycled. Who is correct?