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I need proceedure to adjust compressor clutch air gap 2000 silverado 5.3

chuckmc8 on Mon June 29, 2009 9:39 AM User is offline

Year: 2000
Make: Chevrolet
Model: Silverado

I belive that I have narrowed a cycle problem on my 2000 GM silverado 5.3 engine,(165K miles) to that it needs the clutch air-gap adjusted. I think that it has the H6 delphi compressor, although it is very difficult to see/identify.
Could someone please explain the adjustment procedure or point me into a direction that has the tech info? Do most box parts stores (auto zone, advance) loan the tool needed for this?
If the clutch has to be removed, wouldn't it be better to replace the clutch with a new one? I couldn't find a clutch listed for sale, only the compressor with the clutch installed is what I am finding. Any source for the clutch assembly separately?
I would much rather not have to remove the compressor and have a break in the system as the compressor is quiet, cools nicely and doesn't leak.
Any ideas? Thanks a lot!

chuckmc8 on Wed July 01, 2009 7:15 AM User is offline

anyone able to help with this?

GM Tech on Wed July 01, 2009 7:33 AM User is offline

What is your failure mode? clutch drag/hiss when a/c off or clutch won't pulli n when hot? If it is an HU-6 Delphi unit- identified by the label, or the manifold connections (H-6 series are molded together) Nippondensos are separate manifolds for suction and discharge. then a clutch remover / installer is needed- borrowed from autozone--- if it is a Nippondenso unit- then remove the center bolts and pry the clutch off- and remove any shims that make the gap too wide--...

The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

chuckmc8 on Wed July 01, 2009 5:45 PM User is offline

It works normally until the first cycle off, then the clutch doesnt re-engage. I checked it with a screwdriver against the clutch when it should be reengaged, it has magnetic pull. There is not enough room to tap the clutch to see if it will reengage. If I depress the a/c button for a few minutes and then turn it back on, it comes back on and all is fine until it cycles off again. It has the H6 (lower mount on 5.3) delphi compressor. Thanks a lot!

mk378 on Wed July 01, 2009 6:28 PM User is offline

You're going to need about 3 inches of clearance in front of the compressor for the clutch installer tool. Hopefully you can either remove other parts or un-mount the compressor with the lines still attached.

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