Practice question

During recovery on a bus A/C system, the recovery machine repeatedly rises back into a positive pressure after shutting off. This usually indicates:

  1. Refrigerant is still boiling out of the oil and more recovery time is needed
  2. The high-pressure switch failed
  3. The orifice tube is missing
  4. The recovery is complete

Answer: A — Refrigerant is still boiling out of the oil and more recovery time is needed

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