91 Caprice alternator and AC - Chevy Impala SS Forum
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post #1 of 19 (permalink) Old 12-25-2005, 05:03 AM
Bad_Bowtie
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Is it known that the Alternator and/or A/C compressor on a LO3/LO5 can turn out into some really loud noise making devices throughout the years due to usage?

One of them makes a rattling noise at some point in RPM's that sound metal-like. This only occurs when the engine is fully up to operating temperature.

Anyone?
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post #2 of 19 (permalink) Old 12-26-2005, 07:19 PM
pistoldemon
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Wink

Inspect it by hand, a lot of play means you can thrown it in the river, or use it as a core.
post #3 of 19 (permalink) Old 12-27-2005, 07:29 AM
Thelyricist720
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My Alternator recently crapped out on me on my L05. It was making a horribly loud sound and was making me very weary to drive. I got it taken care of a day or two after I started hearing the sound. I think since I have the 9c1 it's rated at 120? or 125? Anyway, I went with a Duralast alternator and so far it's working great. I don't know what the problem was with the old one but I know it was loud and very annoying lol.
 
post #4 of 19 (permalink) Old 12-28-2005, 12:52 AM
DeathSStar
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Correct me if I'm wrong, but if it's making that scraping metallic noise it pretty much means that the bearing is toast...?
post #5 of 19 (permalink) Old 12-28-2005, 03:40 PM
Bad_Bowtie
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Worn out?

Could that be at some specific RPM when the engine is at normal operating temperature?
post #6 of 19 (permalink) Old 12-28-2005, 05:07 PM
Thelyricist720
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As for me it was my bearings in the alternator. They just gave up.
post #7 of 19 (permalink) Old 12-29-2005, 11:03 PM
Caprice93
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On the LO3 I sold to my dad, the alternator was making some noise and seized up on him last week! stalled the engine. I had to have it towed to my place to install a new alternater and belt, also put a new tensioner pulley for it sounded like it was full of sand. To isolate your problem would be to take the belt off and spin the items by hand. listen and feel. they should be smooth!
post #8 of 19 (permalink) Old 12-30-2005, 01:09 PM
vandal835
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the AC compressor clutch makes some nasty noises when it fails. It jingles, Squeaks, grinds.
post #9 of 19 (permalink) Old 12-31-2005, 02:32 AM
Bad_Bowtie
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The ac still works and blows really cold. ( I had it refilled with 416a, that is a replacement for the old R12 with the same caracteristics)

Strange thing is, it only occurs when the engine is at full operational temp. And then it only happens at a certain RPM. Just a tad above idle RPM.

AAAAAAAAAAAAHHH! I hate these annoying unidentified sounds!
post #10 of 19 (permalink) Old 01-04-2006, 11:16 PM
Caprice93
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Maybe the fan clutch? with engine off check the front of it for leakage and or excessive play.
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