Quote:
Originally Posted by bjt135psu
Found this post and I need some advice. I purchased my '11 335i about 2 months ago and have been fighting the belt squealing most of my ownership. Below is what I have done or experienced in order.
Noticed squealing
Belt Replaced - squealing stopped
Few weeks later - starting squealing again
Replaced both deflection pullys and belt tensionor - squealing continued
Completed water test and squealing paused
Belt Replaced - squealing stopped
Few weeks later - squealing started again
Identified coolant leak and replaced vent line (coolant leaked over belts; cleaned engine bay)
Squealing still continues as I start the car. It's not as loud as or as constant as it was before the tensionor, belt and pulleys were replaced. I've tried turning off the AC and the squealing persists.
What next?
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Are you sure you don't have any oil leaks? If your OFHG and/or VCG have never been replaced they are probably leaking oil on the belt. That's what caused mine to squeak. I replaced the belt and the gaskets at the same time and it never squeaked again.