Serpentine Scream - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 11-03-2003, 09:59 PM   #11
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is it like a sqeaking noise cuz mine does the same thing but in cirtin weather conditions. and were are the alt bearings at?
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Old 11-06-2003, 07:13 PM   #12
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No, not a squeaking, more like a constant "shing"

Don't know where the alt bearings are. Sorry.
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Old 11-06-2003, 10:05 PM   #13
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I had the same thing.... swaped out my alt with one from the junk yard.... wala no more skreeming
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Old 11-06-2003, 11:33 PM   #14
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yah i just had the same problem i started hearing a squealing noise and looked at my guages and certian enough the battery level was going down really far but its ok cuz i just swapped it for a new one from autozone since i bought one from them with a lifetime warranty haha i was happy i didnt have to pay anything
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Old 11-07-2003, 03:13 AM   #15
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The mechanic'* stethescope can be invaluable. I've used it numerous times, mostly on other people'* cars.

If you used it to diagnose your power steering pump, go with your instincts. It'* still kinda hard to tell for sure.

The most likely causes (in no particular order) are the Alternator (although they usually don't emit a sound to tell you they're shitting) and the idler/tensioner.

Third would be the AC clutch.
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Old 11-07-2003, 04:56 AM   #16
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I 'accidentally' learned one sure way to tell if the 'shrieking' or 'squealing' is caused by a faulty bearing and which accessory is the culprit.

My car had been briefly 'squealing' off and on for a couple weeks. One night as I'm driving to work it was really loud and didn't stop like it usually did. So I stopped at a gas station to look the engine over. When I raised the hood, I looked around a little, didn't see anything, so I leaned in for a closer look, placing my hand on the top of the alternator to support my weight. Woohoo!

The alternator was extremely hot. Not just 'extremely warm' as alternators get under normal circumstances, but burning hot. Good thing that area of my palm was protected by callous, it glazed the dead layers of skin and resulted in a minor burn. But there was a nice 'sizzle' sound when I touched it. lol!

So I replaced the alternator the next day and all was well. Note that I am not recommending this method of diagnosis. I said it was a 'sure' way to tell, not a safe one. :P

I was actually going to recommend holding your open palm a few inches away from the alternator or other accessories to see if there is an unusual amount of heat radiating from any particular accessory, not touch them. After I burned myself, I held my other palm about six inches away from the alternator and could feel the heat coming from it unlike any other accessory.

YMMV.
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