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      01-01-2013, 09:00 PM   #1
jsllsj
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Whirring noise from the engine bay

Hi All,

This afternoon when I started my M3 there was a whirring noise that was pretty audible from the cabin. I've never heard the noise before, but I thought maybe it was just the car warming up. I drove it around for a few miles, and the noise was mostly consistently there, but disappeared for a few seconds at a time. I captured it on video:



Any idea what it could be? My mechanic is closed for the holidays so I won't be able to take it in for another few days.

Thanks!
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      01-01-2013, 09:07 PM   #2
MilehighM3
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Have you checked the level and condition of your power steering fluid?
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      01-02-2013, 12:11 AM   #3
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^Could be PS fluid if it makes more noise as you turn the wheel

To me it sounds like a pulley bearing
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      01-02-2013, 11:24 AM   #4
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Have you had your brake fluid changed recently? Kind of sounds like your brake solenoid working overtime. Just a guess, it's kind of hard to tell from the bid.
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      01-02-2013, 01:09 PM   #5
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I just checked the power steering fluid and its at the correct level. I didn't change the brake fluid recently. Strangely the sound was completely gone this morning. I still made an appointment to get it checked out.
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      01-02-2013, 01:32 PM   #6
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Not sure about the power steering, but I do hear a squeaky pulley or serpentine belt.
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      01-02-2013, 04:03 PM   #7
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Quote:
Originally Posted by jsllsj View Post
I just checked the power steering fluid and its at the correct level. I didn't change the brake fluid recently. Strangely the sound was completely gone this morning. I still made an appointment to get it checked out.
I am pretty sure it is a pulley bearing..moisture on a cold engine sometimes causes that noise. If its gone and you cant replicate at the dealer they will most likely do nothing for you.
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      01-03-2013, 06:45 PM   #8
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Just got it back from the mechanic. He wasn't able to reproduce the sound and said it had to do something with it being a cold start and not to worry about it unless the sound is constantly there.
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