Loud Thumping AC Compressor

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12-18-2006 | 04:56 PM

beagles

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Joined: Dec 2006

Posts: 1

Loud Thumping AC Compressor

What is causing a lound thumping noise when the ac compressor kicks in, its seems to come from the heater box, noise increases with RPM's, 2006 GMC Sierra 4.8L,

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