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Fan squeals when AC or defrost is put on - 1999 Buick Regal

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Sounds like your ac bearing is going out, the Buick uses ac on defrost as well so it would probably be that, you can check by centralizing the sound with a short section of hose to listen for the sound

Posted on Jun 27, 2011

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Posted on Jan 02, 2017

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Year make and model ??
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You could have a weak belt tensioner too.
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