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ASE Automobile & Light Truck (A1–A8) — Practice Exam

A7 Operating systems and controls: practice questions

Our ASE A1–A8 bank has 16 questions on this topic. Here are 5 of them with answers; the full mock exam draws from every topic, like the real one.

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Question 1 · A7 Heating & Air Conditioning

What does the high-pressure cutoff switch protect against?

  1. Excessive high-side pressure
  2. Low refrigerant charge and oil
  3. Blower overload
  4. Evaporator icing
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A. Excessive high-side pressure — A pressure relief valve is a last-resort safety device.

Question 2 · A7 Heating & Air Conditioning

What does the A/C low-pressure (or pressure) switch do?

  1. Controls blower speed according to refrigerant pressure on the low side
  2. Turns on the defroster
  3. Prevents compressor operation when refrigerant pressure is too low
  4. Opens the blend door
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C. Prevents compressor operation when refrigerant pressure is too low — It protects the compressor from running without enough oil flow.

Question 3 · A7 Heating & Air Conditioning

The A/C works at highway speed but not at idle. Which cause is likely?

  1. A bad blower resistor that limits blower speed
  2. A cooling fan that isn't running
  3. A clogged heater core
  4. A bad blend door
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B. A cooling fan that isn't running — At idle the condenser relies on the fan for airflow.

Question 4 · A7 Heating & Air Conditioning

What is checked with a thermometer in the center vent during a performance test?

  1. Vent outlet temperature compared with the maker's chart
  2. Compressor oil level
  3. Refrigerant purity and the amount of oil in the system
  4. Engine coolant temperature
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A. Vent outlet temperature compared with the maker's chart — Conditions such as humidity and ambient temperature affect the reading.

Question 5 · A7 Heating & Air Conditioning

A clicking noise behind the dash when changing temperature settings suggests what?

  1. A low refrigerant charge
  2. A bad blower motor
  3. A clogged cabin filter vibrating in its housing
  4. A blend or mode door actuator with stripped gears
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D. A blend or mode door actuator with stripped gears — Recalibrate after replacing an actuator.

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