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Discussion Starter · #1 ·
2 weeks ok i replaced my clutch fan and expansion tank after i had an over heating episode. now my Aux fan will come on after car is shut off and run untill the battery is dead. The Aux fan is also very loud and sounds like a small aircraft ready to take off.

help me out here please
 

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2 weeks ok i replaced my clutch fan and expansion tank after i had an over heating episode. now my Aux fan will come on after car is shut off and run untill the battery is dead. The Aux fan is also very loud and sounds like a small aircraft ready to take off.

help me out here please
There is nothing we can help you. You've got the culprit by the horn. BTW, don't buy aftermarket aux fan, stick with OEM or you will be doing twice.
 

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Discussion Starter · #3 ·
changed fan

Well i changed my Aux fan. so far so good. never worked on a BMW like this before and was not looking forward to pulling entire front end apart. 2 hours later its back together and running good... only thing is even the new fan is loud as well. am i missing something here that is making the fan run at such a high speed?
 

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The fan will be loud. It's an electric motor running at high speed.
 
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