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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > Regional Forums > UK > 335i - Cold Start Belt Squeal



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      12-05-2019, 06:23 AM   #1
snaeem155
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335i - Cold Start Belt Squeal

I had an issue with a horrible humming noise which BMW advised was the AC compressor and tensioner pulley, this was replaced under warranty.

When I got my car back I realised it has a terrible chirping/squeal noise on all cold starts which went after 20 mins of driving.

Took it back to them and they said I need a new drivebelt at 65k miles. This noise wasn't there prior to the AC compressor and tensioner repairs.

So I coughed up and got it replaced, 2 weeks later the noise is starting to come back.

BMW are being total tools, I was wondering what it could be?

I'm leaning towards they did a botch repair to the tensioner pulley?
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      12-07-2019, 11:30 AM   #2
matt_s
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Sounds suspiciously like mine was, albeit different model... hope this helps.

https://www.e90post.com/forums/showthread.php?t=1650484
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      12-07-2019, 05:48 PM   #3
x77md
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I had a horrible vacuum/squeal sort of sound on cold starts (~70k mileage) which went within 15mins of driving - drove me absolutely nuts. Turned out to be one of the alternator pulleys, got each pulley changed costing £350 parts + labour and no issues or sound since.
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