02 325I squeaking/squealing noise - Bimmerfest - BMW Forums



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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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Old 05-27-2017, 03:11 PM
srhaddon1 srhaddon1 is offline
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Location: savannah
 
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Mein Auto: 2002 bmw 325i
02 325I squeaking/squealing noise

My 325I has a squealing noise when I start it that lasts for about 15 min or so while driving and then goes away. I have changed my idler pulley and the other two pulleys (AC and tensioner). I poured water on the AC belt prior to changing that pulley and the noise stopped temporarily which made me think it was that pulley..... what could it be? The AC belt does appear to be in good condition. Help.
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Old 05-27-2017, 04:18 PM
cvx5832 cvx5832 is offline
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Location: Walnut Creek, CA
 
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Mein Auto: 325Ci, 325Cic, C300
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Originally Posted by srhaddon1 View Post
My 325I has a squealing noise when I start it that lasts for about 15 min or so while driving and then goes away. I have changed my idler pulley and the other two pulleys (AC and tensioner). I poured water on the AC belt prior to changing that pulley and the noise stopped temporarily which made me think it was that pulley..... what could it be? The AC belt does appear to be in good condition. Help.
The tensioner mechanism itself will squeak when it gets old. It's a greased mechanism and eventually runs dry.
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Old 05-28-2017, 01:29 PM
srhaddon1 srhaddon1 is offline
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So I need to remove it and grease it? But why does the squealing stop after 15 to 20 minutes?
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Old 05-28-2017, 03:57 PM
cvx5832 cvx5832 is offline
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Location: Walnut Creek, CA
 
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Mein Auto: 325Ci, 325Cic, C300
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Originally Posted by srhaddon1 View Post
So I need to remove it and grease it? But why does the squealing stop after 15 to 20 minutes?
I don't think they come apart. I don't know the answer to your second question.
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