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Exam 10: System Controlsdiagnosis and Service of System Controls

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Question 21

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Name four methods of temperature control used on modern air conditioning systems.

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Thermostat,pressure ...

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Question 22

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Why can the high- and low-side temperature switches be used to measure system pressures?

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System temperature and system ...

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Question 23

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The usual service problem with vacuum reserve tanks is

The temperature fluctuates between hot and cold on a vehicle equipped with an automatic temperature control system.Which of the following is the most likely cause?

Self-diagnostic systems display trouble areas as a code.

The stepped resistor blower speed control has four or five speed positions.

How does the automatic temperature control regulate temperature?

An average rating of an air conditioning system fuse or circuit breaker is ____ amperes.

-The blower motor in Figure has blower motor speed M2,M3,and High speed.But does not run in either LOW or M1.Which of the faults listed below could be the cause:

The ambient air temperature sensor monitors the temperature of the outside air.

What is a blower motor power module?

What is the relationship of the aspirator to the in-car temperature sensor?

A blower motor is being tested for resistance.Technician A says a higher than specified resistance would cause slower blower operation.Technician B says trash or other items could restrict the blower,causing motor resistance to go up during operation.Who is correct?

What is the purpose of the air conditioner control panel?

Air conditioning is not generally required at temperatures below 50°F (10°C).

Technician A says the purpose of lthe pressure cutoff switch is evaporator temperature control.Technician B says the purpose of the pressure cutoff switch is system protection.Who is correct?

If blower motor speed control is provided by resistors,the motor will have three windings.

Explain how the internal circuits of a circuit breaker respond to an overload and how the breaker resets.

Technician A says before attempting to remove the blower motor resistor,ensure that it is not hot.Technician B says the blower motor may have a power module.Who is correct?

Technician A says a four-speed blower motor control is a five-position switch.Technician B says all blower motors have several windings in the motor to assist in speed control.Who is correct?