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

A7 HVAC and cooling diagnosis: practice questions

Our ASE A1–A8 bank has 23 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

Both pressures are high and cooling is poor. Which cause is likely?

  1. A slipping compressor clutch
  2. Poor airflow across the condenser or an overcharge
  3. A low charge
  4. A stuck-open expansion valve only, flooding the evaporator
Show the answer

B. Poor airflow across the condenser or an overcharge — Check the cooling fans and condenser fins.

Question 2 · A7 Heating & Air Conditioning

The heater is weak while the engine is at normal temperature, and both heater hoses feel different temperatures. What is likely?

  1. A restricted heater core
  2. A stuck-open thermostat
  3. A low refrigerant charge
  4. A bad A/C clutch
Show the answer

A. A restricted heater core — Also check for trapped air and the blend door.

Question 3 · A7 Heating & Air Conditioning

Low side is high and high side is low, with the compressor engaged. What does this suggest?

  1. Air in the system
  2. A restricted orifice tube with debris
  3. An overcharge
  4. A worn or failing compressor
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D. A worn or failing compressor — The compressor can't build a pressure difference.

Question 4 · A7 Heating & Air Conditioning

A sweet smell inside the car and a fogged windshield suggest what?

  1. A refrigerant leak
  2. A bad blower motor
  3. A leaking heater core
  4. A clogged cabin filter
Show the answer

C. A leaking heater core — Coolant mist condenses on the glass.

Question 5 · A7 Heating & Air Conditioning

What safety property of R-1234yf requires special equipment and procedures?

  1. It is corrosive to steel
  2. It is highly toxic at any level
  3. It is mildly flammable
  4. It has a very high boiling point
Show the answer

C. It is mildly flammable — It is classified A2L; use equipment designed for it.

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