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The BMW Range
5 Series
E39
E39 Aux fan (electric fan)
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<blockquote data-quote="haywire" data-source="post: 562162" data-attributes="member: 16474"><p>Bro, before the car wash your car was sufficiently cooled because it was moving and probably the fans were working so that the engine is at an optimum temperature.</p><p></p><p>When your car was stopped and turned off for the wash, temperature rises because the fan was not working but the engine is still hot. So say when you stopped the car, the temp was 85, by the time the car was washed the temp has climbed to 95 (as an example) so the aux fan kicks in at max speed and noise to bring it back down to 85.</p></blockquote><p></p>
[QUOTE="haywire, post: 562162, member: 16474"] Bro, before the car wash your car was sufficiently cooled because it was moving and probably the fans were working so that the engine is at an optimum temperature. When your car was stopped and turned off for the wash, temperature rises because the fan was not working but the engine is still hot. So say when you stopped the car, the temp was 85, by the time the car was washed the temp has climbed to 95 (as an example) so the aux fan kicks in at max speed and noise to bring it back down to 85. [/QUOTE]
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