335i

snaeem155 · 12-05-2019, 06:23 AM

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?

matt_s · 12-07-2019, 11:30 AM

Sounds suspiciously like mine was, albeit different model... hope this helps.

https://www.e90post.com/forums/showthread.php?t=1650484

x77md · 12-07-2019, 05:48 PM

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.

12-05-2019, 06:23 AM	#1
snaeem155 Private 3 Rep 94 Posts Drives: 335i Join Date: Jul 2018 Location: London iTrader: (0)	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 Private 15 Rep 55 Posts Drives: 330d e90 Join Date: Jul 2012 Location: Costa del Sheffield iTrader: (0)	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 Second Lieutenant 82 Rep 297 Posts Drives: golf tsi Join Date: Aug 2018 Location: leicester iTrader: (0)	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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