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Pinpoint Test E: Engine Driven Cooling Fan Moan

  1. E1 CHECK THE ENGINE DRIVEN COOLING FAN AFTER A COLD SOAK 
    • Carry out the VEHICLE COLD SOAK PROCEDURE .
    • Key in START position.
    • Assess the airflow.
    • Raise the engine speed to 1500 rpm while listening for the moan to increase in proportion to the airflow.
    • Key in OFF position.
    • Does the moan increase in proportion to the airflow? 
    1. Yes:  TEST the fan for normal operation. If the fan tests normal, GO to E2. Otherwise, REPAIR as necessary.
    2. No:  Normal system operation.
  2. E2 CHECK THE ENGINE DRIVEN COOLING FAN AT NORMAL OPERATING TEMPERATURE 
    • Key in START position.
    • Run the engine to normal operating temperature while listening for the moan to stop.
    • Key in OFF position.
    • Does the moan stop? 
    1. Yes:  Normal clutch operation.
    2. No:  INSTALL a new fan clutch. TEST the system for normal operation.
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