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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 11-28-2012, 07:17 PM   #1
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Join Date: Oct 2012
Location: Nashville, TN
Posts: 687
My Ride: 2001 325i
Aviary under my hood: whistling, chirping

My '01 325i now has 101K on her. Went to start the car this morning and heard noises from under the hood that sounded like the bird cages at zoos.

The whistling, from what I have read here, is either a leak in the vacuum line or elbow going to the intake. OR, the CCV, which I suspect. I am getting slightly worse gas mileage and the power seems a little off.

I drove the car by a shop today and actually got it to chirp (only does it on the rare occasion) and the mechanic said it sounded "bearing-ish" to him. It comes from the front, so I assume the bearings in question could be in the water pump or fan clutch. I did notice a slight bit of wiggle in the fan blade when I cut the engine off. The mechanic also said that could be a loose belt or bad pulley. I am taking the car to him on Friday for a proper diagnosis. He's going to take the bottom plate off so he can see everything going on from the underside.

Mango, do you think it is time for the blitzkrieg approach to a cooling system refresh? With a fresh dose of pulleys as well?

Last edited by vandyboy; 11-28-2012 at 07:18 PM.
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Old 11-28-2012, 07:49 PM   #2
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Join Date: Jun 2012
Location: Atlanta
Posts: 409
My Ride: 330i
Probably a pulley or idler bearing going bad.
'02 330i
'97 318i
'95 325 Vert
'76 280z
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Old 11-28-2012, 11:03 PM   #3
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Join Date: Mar 2006
Location: Southern California
Posts: 26,430
My Ride: Lexus
Regardless of what problem you're having, I definitely recommend a full cooling system replacement. This will fix your problem, I'm sure. GL!
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