Pinpoint Test E: Engine Driven Cooling Fan Moan
- E1 CHECK THE ENGINE DRIVEN COOLING FAN AFTER A COLD SOAK
- Carry out the VEHICLE COLD SOAK PROCEDURE in this article.
- 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?
Yes : TEST the fan for normal operation. If the fan tests normal, GO to E2. Otherwise, REPAIR as necessary.
No : Normal system operation.
- 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?
Yes : Normal clutch operation.
No : INSTALL a new fan clutch. TEST the system for normal operation.