Practice question

A bus automatic system blows the correct temperature but airflow will not switch from panel to floor/defrost. The most likely cause is:

  1. Low refrigerant
  2. A mode-door actuator or its control circuit fault
  3. A failed compressor
  4. A dirty condenser

Answer: B — A mode-door actuator or its control circuit fault

The correct answer is shown above. Try the full quiz for additional practice.

Practice more: ASE S7 Air Conditioning Systems & Controls (School Bus) Practice Questions - ASE S7 - Air Conditioning Systems & Controls (School Bus) Certification Exam →