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2 wd gmc sierra ext cab. 2001. Small v8 vortec engine. The a/c compressor makes a noise. I believe this is what it is. There is no noise at all when the fan is off. There is a noise when the fan is on and if the a/c is on and off.the noise sounds similar to the relief valve on the air brake system of tractor trailers. thanks

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  • Cars & Trucks Master
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If there is no noise when a/c is on and off, but there is noise when the fan is on, then I think it's the fan.

The fan on the radiator a/c should go on when first turning a/c on.

Hope this helps.

Good luck to you.

Posted on Jul 05, 2010

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