Question about Cars & Trucks

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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Duane Wong

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Cars & Trucks Master
6,826 Answers

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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Distributor Connections:
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4------->o........o<-------3
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Let me know if this helped, or if you have additional information or questions. Feel Free to contact me at FixYa.com!

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1 Answer

Duane Wong

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Related Questions:

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