H2 DADDY, Its the tensioner pully on the main serpentine belt - also called idler pulley by some mechanics. There are two on the H2 and my bet is that it is the lower one - Which of course is harder to see. Open the hood, Put the emergency break on. push the accelerator until RPM's are in the 2000 range. Try this with both air conditioner on and off. And with the Air conditioner fan on and off. Have you recently had an oil change or added any fluids - coolant etc. ???
Let me know what you find with the above. The H2 motor is at a slightly sharper angle then this VORTEC is usually mounted and we have identified - lets just call them minor quirks.
Also double check garage floor or driveway for any fluids.
Best Regards, Hummer Man
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