Cooling fan does not activate even when temp gauge shows it is overheating. Sensor and thermostat have been changed as well as water pump, radiator and timing belt
Well there are only 2 other parts to trow at it. The cooling fan motor or the relay. Let the car warm up and check for power at the fan motor if there is, it's the motor. If there isn't chances are it's the relay, fuse or just a plain old bad connection somewhere.
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where is relay on 1998 z3 1.9