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ASE Medium / Heavy Truck

T7 HVAC — practice test

Studying for T7 (HVAC)? Overhaul Prep has 106 verified T7 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.

106T7 questions
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Sample T7 questions

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

In an A/C system, the component that changes high-pressure liquid refrigerant into a low-pressure liquid/vapor as it enters the evaporator is the:

  1. Compressor
  2. Condenser
  3. Expansion valve or orifice tube (metering device)
  4. Receiver-drier
WhyThe metering device (thermal expansion valve or orifice tube) drops refrigerant pressure, so it can boil (evaporate) in the evaporator and absorb heat from the cabin air. The compressor and condenser handle the high-pressure side.

An A/C system cools poorly. Technician A says a low refrigerant charge can reduce cooling. Technician B says an overcharge or a restricted condenser can also reduce cooling and raise high-side pressure. Who is correct?

  1. Technician A only
  2. Technician B only
  3. Both Technicians A and B
  4. Neither Technician
WhyBoth. Undercharge starves the evaporator; overcharge or a restricted/dirty condenser raises high-side pressure and cuts cooling. Diagnose with manifold gauges — low/high-side readings distinguish the causes.

A truck's A/C compressor clutch will not engage, and a scan tool shows the low-pressure switch is open. The MOST likely cause is:

  1. A severely undercharged (low) refrigerant system
  2. A restricted cabin air filter
  3. A stuck-open blend-door actuator
  4. An open blower motor resistor
WhyThe low-pressure cutout switch opens and disables the clutch when system pressure is too low to protect the compressor from operating without adequate refrigerant and oil. A severe undercharge is the most likely reason the switch is open.

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