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I have a 2000 chevy blazer fully loaded I have had the alternator fan belt and pully changed with relacement parts but it still makes a screeching noise wheather it is on the road or just idling can anyone give me direction as to what it might be

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You might want to check and make sure all your pulleys line up because new parts aren't always the same as factory ones that I would do.

Posted on Nov 10, 2014


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Posted on Jan 02, 2017

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SOURCE: I have a LOUD noise on my 1999 Alero near serpentine belt!!!

check the dynamo pulp ring
or the water pump if the car heat is stable so it's ok

30 $ to change the dynamo pulp ring

Posted on Aug 13, 2009

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SOURCE: i have a 1990 jeep YJ replaced the alternator and

If the belt is not tense enough it will squeal, so make sure it's tight enough. Otherwise you can use a stethoscope or long screwdriver up to your ear to isolate the source of the noise.

Posted on Sep 16, 2009

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SOURCE: noisey drive belt, possibly alternator, belt

sounds like idler bearings but you have to release the tension to check,Also you can check the rest of the pulleys also at this time. I dont think you have to drop the engine.

Posted on Oct 06, 2009

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You might find something here

Posted on Oct 16, 2010

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I have a rattling sound up towards my belts. kinda sonds like a ceased barring. near my alternator

The best way to find the noise is to remove the belt
and check each pully by hand. If a pully locks up it
will make more of a screeching sound. A rattle sound makes me think your idler pully is loose.
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