Quote:
Originally Posted by hpy540
Can just the relay for fan be bad? How common is that? Very common on e39
. I believe my fan not working causin ac not to work.
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Looking at the wiring diagrams, I can't see a relay anywhere in the fan circuit.
The fan has 12v on the motor control board (inside the hub) anytime the ignition is on and a pulse-width modulated signal from the DME controls the fan on/off and speed modes.
If the fan runs when the pressure switch is disconnected, as you have indicated in another post, then the issue you have isn't likely to be related to the fan or it's control systems.