Question about 2000 Chevrolet Astro

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Alternator noises I am hearing a squeaking sound especially at start-up. I changed the serpentine bely and belt tensioner but the nose is still there.Could it be the bearings in the alternator and can I leave it like that for now?Email -ajuron@yahoo.com. Thank you.

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  • andrew782 Oct 03, 2008

    Thank you.I think it was partially the alternator (it was squeaking removed it and spinned it in my hands.I replaced it but the noise was a little different now.I went bt strauss and the guy there told to try belt dressing and the noise stopped fro a couple of days.I think the belt tensioner is out of alignment.

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It sure can be the alt. you should be able to remove the belt and spin the alt see how smooth it is. and no i woulnd drive it untill i found out . it could lock up on you.

Posted on Sep 17, 2008

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My serpentine belt is a little bit loose. Do I tighten the belt using the tensioner or should I use the pry the alternator forward method?


The tensioner is an automatic device. You DONT Adjust it. Sounds like you need a new belt and probably should replace the tensioner. Tensioner have a limited lifespan usually 75000 to 100000 miles

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The belts continue to make a loud screeching noises when i drive over 55. Sometimes when the car is idling the belts make noise. Could it be the tension pulley.


it could be the tensioner, water pump, alternator, A/C compressor, power steering, or even a really bad serpentine belt. The only way to be sure is to remove the s-belt and spin-check the pulleys and listen for squeaks or grinding bearings.

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It's most likely a slipping belt. If the belt is heavily glazed, replace it. If it is a serpentine belt, check the spring on the belt tensioner - it should take a significant amount of force to pull it back to release the belt.

Also, check the tensioner pulley, alternator and A/C clutch bearings while you are at it. If there is any roughness or play in the bearings, this could generate noise.

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If it is the belt, you need to buy a special tool made to relieve the pressure from the belt tensioner, As you do that the belt will slip off. Don't let anybody tell you that you can use a ratchet and socket to loosen the tension. If your tensioner is not designed to work like that, it will strip the bolt out. While you have the belt off, turn all of the pulleys and make sure that they are not the cause of the squeaking sound. Make sure to memorize where your belt goes, a serpentine belt can be very confusing to put back on if you don't remember how it came off.

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a squeaking belt can be caused by wrong tension [belt slips] if belt looks polished then thats whats happenedif it has any cracks or polish marks replace it!

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It is either your serpentine or another belt such as an alternator belt causing the squeak.

This can be resolved by either replacing the belt or making sure the tension is correct.

If it is a serpentine then replacing it will be necescary if it is alternator belt there are ways to tighten it.

Belt dressing is another temp fix for the squeal. the belts become glazed over time and will squeak and chatter spray some belt dressing on it and the squeak will go away for a while.



How loud is the squeak? 1-10

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