Symptom Related Diagnostic Procedures

Radiator fan operation faulty
Fault symptoms
Radiator fan operation faulty

Diagnostic help
The tester can be used to activate the relay outputs concerned as well as low speed and high speed operation.
If no information on the coolant temperature is supplied, low speed operation will start.

Check the wiring
Jiggle the wiring harness at several points and in different directions to reveal intermittent breaks and short-circuits in the wiring harness. Observe the multimeter, test lamp or diagnostic instrument while doing this.