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Discussion Starter #1
So i replace my shorted aux fan with a new behr/mahle unit and damn this thing is loud. every time it turn on or off, it sounds like a turbine, once running it sounds fine. also because of the noise when it activates, i now notice how much the fan come on and off seemingly without a/c. anyone else dealt with this on a new fan unit?
 

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I replaced mine last year with a Behr unit. It does make more noise but nothing crazy. Then again my aux fan didn't work at all since I bought the car.
 

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They are just loud in general. I replaced the same fan on my old 540i with a brand new OEM BMW unit from the dealer ($500-ouch!). And it was still as loud as the old one. Annoyed but that's how they are.

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Discussion Starter #4
this new aux unit definitely messed up, you can hear it winding down for like 7 secs or more after i shut off the car. the old oe fan was whisper quiet, only the sound of air moving before it melted. gonna try another unit when i get a chance.
 
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