Help, My 99 528i is making whistle sounds! - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 09-29-2008, 03:05 PM
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Help, My 99 528i is making whistle sounds!

Today when I started my car I heard a loud whistle sound. The sound continued while I was driving. I also noticed that after about a half hour of driving, my temp gauge was still in the blue. This was the first time this has happened. Does anyone know what thei can be?
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#2 (permalink) Old 09-30-2008, 05:41 AM
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Sounds from where??, Inside the cabin, under the hood, low or high pitched?

1st turn the A/C off and the fan, see what happens! its a matter of elimination process, so we will go through one thing at a time.

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#3 (permalink) Old 09-30-2008, 11:18 AM
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Hi, thanks for replying. The sound is coming from under the hood. Sometimes it is a low pitch whistle and then it will get loud. When it is loud it seems like a squealing sound. I noticed when I turned off the car after looking under the hood for the sound that there was an "ERRRRR" sound for about 2 seconds from somewhere under the hood. The AC was off when I looked for the sound.

Again, thanks for your reply!
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#4 (permalink) Old 09-30-2008, 11:48 AM
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Ok, one of 4 possibles

1, viscous fan

2, alternator

3, water pump

4, loose belt

Start her up with the hood up so you can localise the noise then get back to me

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