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ASE Automobile

A7 Heating & Air Conditioning — practice test

Studying for A7 (Heating & Air Conditioning)? Overhaul Prep has 121 verified A7 questions written to the current task list — in the same formats the real exam uses (direct, Technician A/B, EXCEPT and most-likely-cause). Every answer comes with a written explanation, so you learn why instead of memorising a letter.

121A7 questions
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9,711questions in total
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Sample A7 questions

Straight from the bank — answers highlighted, with the explanation underneath.

In an automotive air-conditioning system, which component causes the refrigerant to change from a high-pressure vapor into a high-pressure liquid?

  1. Evaporator
  2. Condenser
  3. Compressor
  4. Orifice tube
WhyThe condenser rejects heat to the outside air, causing the high-pressure vapor leaving the compressor to condense into a high-pressure liquid. The evaporator does the opposite—it absorbs heat and boils low-pressure liquid into vapor.

Technician A says the condenser is part of the high-pressure side of the A/C system. Technician B says the evaporator is part of the high-pressure side. Who is correct?

  1. Technician A only
  2. Technician B only
  3. Both Technicians A and B
  4. Neither Technician
WhyThe condenser sits on the high side between the compressor and the metering device, so A is right; the evaporator is on the LOW side downstream of the metering device, so B is wrong.

A vehicle has an oily film that keeps forming on the inside of the windshield, a sweet odor in the cabin, and the coolant level slowly drops with no visible leaks under the vehicle. The technician should MOST likely suspect:

  1. A leaking heater core
  2. A clogged evaporator drain
  3. A leaking blower motor housing
  4. A thermostat stuck open
WhyA greasy fog on the glass plus a sweet (ethylene glycol) odor and unexplained coolant loss are the classic signs of an internally leaking heater core venting coolant into the HVAC case. A clogged evaporator drain produces clear, odorless water on the floor, not an oily sweet-smelling film.

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