Question about 2002 Chevrolet Silverado 2500HD

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Clattering sound when a/c is on and accelerating. goes away when i turn the a/c off. Clattering is under the hood, but i can't locate it.

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  • ranger20 Jul 14, 2009

    6.0 v8 gas engine

  • BB1BUD May 11, 2010

    WHAT ENGINE?

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It may be low grade gas try switching to mid grade fuel and see if it fixs the problem, if not then the chatter is most likely the compressor clutch. to find it you can use a broom stick and put it to your ear and put it on the clutch, be sure not to touch any moving parts, and listen near the clutch on the AC with the ac on, if thats where the chatter is then the clutch may be going out on the ac compressor, if it's not noisy then try putting the stick on the valve covers and see if you hear the noise better, if you do, this could be caused by a knock sensor being bad or the engine having to much carbon build up in the engine also check the water leveal to make sure thewre is enought water in the radiator, you did not mention if it was getting hot or not and low water added with the AC compressor being on could cause this as well.

Posted on Jul 14, 2009

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  • Master
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Sounds like the a/c compressor has internal damage .
I would take to a shop , Let them diagnose it by recharge the system with dye. Then check for leaks, The orfice tube has a small filter in it. IF the filter is clogged with metal shavings the compressor is damaged internally. The correct repair will be a compressor, drier and expansion tube or orfice tube.

Good luck .

Posted on Jul 14, 2009

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