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Old 07-11-2006, 06:21 PM
KCM KCM is offline
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Join Date: Jan 2004
Posts: 640
I second a loose belt as the cause. The compressor on my 300 started making this god awful noise at idle, as if the compressor was grinding it's inner workings. Tightened the belt and it was quiet again. Mercedes should have used two belts instead of one on the A/C in my opinion.
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