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      07-29-2014, 09:31 PM   #9
f30GTR
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Drives: 2014 AW F30 335i M-Sport MT
Join Date: Oct 2008
Location: Chicago

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Quote:
Originally Posted by BMRGUY View Post
I see the noise increases with RPM thus its not the fan. Sounds like a bearing noise coming from one of the pulleys OR the pulley tensioner... OR the belt itself. Inspect your belt and see if there is any cracking, or other wear, etc.

It could also be a vacume leak BUT that would also result in poor power and loss of fuel economy... Probably not that

Could also be the timing belt..

No matter what have it inspected.
It does sound like a belt at least on my phone. I've had similar noises from belts in past cars and they all did when the engine was cold. Ones it warmed up the noise would be gone.
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