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2004 300Ci squealing / whistling noise at low RPM

5K views 14 replies 5 participants last post by  Jiggs46 
#1 · (Edited)
Hey guys, this is my first post so please be gentle!

I've got a 2004 330Ci with 85k on her. Over the years I haven't really had many problems but this morning I ran into a tricky little noise.

I started her up and there was this bizarre whistle / squealing noise. It's very subtle but seems to get louder as I increase the rpm. The sound is unlike anything I've heard with a standard belt / water pump issue. Luckily I was looking for solutions and I came across this guys YouTube video and his 330 has the same exact sound!

http://www.youtube.com/watch?v=vrNNlAmhjw0

(It's worth mentioning that it's around 25 degrees Fahrenheit but that it's been cold for weeks and I haven't had any trouble)

-Troubleshooting notes-
-no engine lights or codes
-The noise happens in all gears
-I drove around for about 10 minutes hoping it would warm up and go away but it did not
-I don't need to be moving for it to happen
-at really high rpm it disappears but that may just be because the engine is drowning it out

Any idea what this could be?
 
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