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LOUD vibration/rattling when turning on AC


sonick
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Pretty much what the title says. When I turn on the AC, I get a VERY loud rattling/vibration. It sounds like a peice of stiff plastic vibrating on fan blades making a r-r-r--r-r-r-r-r--r-r-r.

 

Any ideas what it is? Not sure if it's related, the bearings on the alternator decided to blow its guts out over the weekend a few days before this same vibration started, so I replaced it. After replacing the alt the noise went away for a bit.

 

But driving today, I noticed that it came back! :mad:

 

Any ideas? My dad says this same thing happened before, and it turned out to be some bearing (in the AC compressor perhaps?)

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Take the serpentine belt off and spin each one of the accessories by hand. They should all spin freely and with little noise. Turn the compressor by hand too (not the pulley, the actual compressor) and see how it feels - if it is stiff to turn or won't turn at all the compressor is probably piling up internally.

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