Thread: Serpentine belt changes speed at idle.
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      06-29-2015, 06:43 PM   #12
jgoens
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Drives: 2013 335i msport
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Quote:
Originally Posted by bk335 View Post
If you're auxiliary fan is running faster than normal it's a good sign the waterpump is on it's way out.
Even if it happens upon startup and not at operating temp?
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