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      06-25-2017, 07:37 AM   #1
patsf1
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Strange rev dependant noise from air vent

Hi, I recently bought an e92 320d privately. I have an issue when driving, I'm hearing a constant noise from the passenger air vent. It's rev dependant and gets more noticeable as the revs increase. It sounds like a blowing noise and it happens when the air blower is on or off, and also when air con is on or off. It isn't load dependent either; just constantly there! Extremely annoying the only thing I can think of is that the serpentine belt is resonating through the air con pipe up through the vent. Anyone know if this is normal? Thanks
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      06-26-2017, 08:25 AM   #2
Phil325i
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I would check the seal at the base of the windscreen and the security of the pollen filter housing. Had a similar noise that I cured by sealing the join at the base of the screen with black pvc tape. I think the air passes round/over the pollen filter and can cause a rushing noise in the area you mention. Worth a try...
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      07-15-2017, 12:15 PM   #3
patsf1
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Quote:
Originally Posted by Phil325i View Post
I would check the seal at the base of the windscreen and the security of the pollen filter housing. Had a similar noise that I cured by sealing the join at the base of the screen with black pvc tape. I think the air passes round/over the pollen filter and can cause a rushing noise in the area you mention. Worth a try...

Thanks, i'll have a look and see if that works.
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