Radiator Cooling Fan Motor: Testing and Inspection

NOTE: Overheating and Cooling system related problems can be the result either mechanical, electrical, or computer related failures. In order to properly diagnose the problem all related systems should be checked prior to reaching a conclusion.

1. Perform a visual inspection.

2. Check the computer system for related trouble codes. If codes exist, service these first before proceeding.

3. Perform a system check.Cooling Fan Inoperative

BASIC TROUBLESHOOTING HINTS:
Electric Cooling fan does not work.

POSSIBLE CAUSES

^ No power to the Integrated Relay Control Module (IRCM).
- Visually inspect fusible links.
- Check for battery voltage at all circuit 38 (BK/O) terminals on the IRCM.

^ Inoperative electric cooling fan motor ground.
- Check continuity of circuit 57 (BK) from the electric cooling fan motor to ground.

^ Inoperative electric cooling fan motor.
- If all wires are OK, disconnect the cooling fan motor electrical connection and with a fused jumper apply battery voltage and ground to the cooling fan.
- Does the electric cooling fan run at high speed?

YES -- Go to Cooling System Testing and Inspection.Cooling Fan Inoperative
NO -- Replace cooling fan motor and retest.