Practice question

A vehicle's AC system cools normally at first, but stops cooling after 30 minutes of driving. Once the system sits turned off for a while, it cools normally again. What is the most likely cause?

  1. The system has a blown compressor clutch fuse
  2. Moisture in the refrigerant is freezing at the expansion valve, blocking refrigerant flow until it melts
  3. The cabin blower motor is running in reverse gear
  4. The radiator cooling fan relay is shorted to ground

Answer: B — Moisture in the refrigerant is freezing at the expansion valve, blocking refrigerant flow until it melts

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