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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 02-03-2011, 11:01 PM
joh99077 joh99077 is offline
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Location: Utah
 
Join Date: Jan 2011
Posts: 11
Mein Auto: 323i
Question What does a vacuum leak sound like?

I have this whirring noise that comes from behind the dash. It seems to really be present on cold mornings. It only lasts for a few minutes and then goes away. It isn't a squeal or a grinding noise. It is more of a whine or a whir. Any ideas?

I have had a code pulled that said I had a small evap leak. Where could I find the vacuum hoses to inspect them?

Thanks for all your help.

2000 323i 5 speed
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  #2  
Old 02-04-2011, 02:41 AM
Hammer432 Hammer432 is offline
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Location: Maryland USA
 
Join Date: Sep 2010
Posts: 44
Mein Auto: 2001 BMW 330i
A vacuum leak is more like a hissing sound.
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