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Originally Posted by 2000CAYukon
It is very hard to diagnose noises, especially when we can't hear it or see it.
There is a clutch on the front of the ac compressor and when the clutch engages, the compressor turns and compresses R134a. Is the noise coming from the clutch or the compressor? A/C clutches do go bad (ask me how I know, mine went out at 80 MPH and took out the compressor - $$$) and they can be replaced without removing the a/c compressor.
Also make sure the belt is not slipping due to a weak tensioner when the a/c kicks on.
//2000CAYukon
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Thanks Yukon. I knew without hearing it I wouldn't be able to get a definite diagnosis, but I hoped I explained it well enough that I could get some ideas. I took the truck in for an oil change today (can't do oil changes here in suburbia when your driveway is on a decent slope like mine) and wouldn't you know it - no noise. I tried running the a/c on the way to the garage to see if it was working. After running the a/c, no more noise!