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it sounds like the compressor drive belt is loose under the hood.or the noise may be the blower motor{blower that pushes air into your car} rule blower motor out by using fan in heat mode. Or maybe a bearing in the clutch has gone out.

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โˆ™ 2008-07-11 22:11:43
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Q: When your AC is turned on it makes a really irritating squealing noise. What could it be?
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