Practice question

The heater control valve is vacuum or cable operated and is stuck closed. What symptom results?

  1. The wheelchair lift will not deploy
  2. Excessive cabin heat that cannot be turned off
  3. The strobe lamp stops working
  4. Little or no cabin/defrost heat because hot coolant cannot reach the heater core

Answer: D — Little or no cabin/defrost heat because hot coolant cannot reach the heater core

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