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99 Chevy Silverado clutch needs a love tap

jgcox6 on Mon May 26, 2008 12:47 PM User is offline

Year: 1999
Make: chevy
Model: silverado
Engine Size: 5.3l
Refrigerant Type: 134

My friends 1999 silverado (250,000 Miles) a-c works great most of the time (will freeze you out of there)...it will just disengage the clutch and blow hot going down the road. If we turn the switch off and you have to leave it off for about 5 minutes then turn it back on...then it will re-engage. It might run for 30 minutes like this or just go 5 minutes and have to do it all over again. When it shut off recently...I got out and tapped it with a screwdriver and it came back on.

Is it a clutch problem? Is it a relay problem? Can we just readjust the gap? Like I said the compressor works great when it is working!

If we need to buy something...then please give us a potential place to buy it....thank you for your time and efforts..And like always...you guys are da bomb!

GM Tech on Mon May 26, 2008 12:58 PM User is offline

Go ahead and remove a shim behind the clutch plate- I've done a few like that--take out clutch bolt- wiggle loose clutch driver- and look for shim(s) - remove one- put it back together- all is fine--- clutch has worn- making air gap too wide......

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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......

jimmycox on Sat May 31, 2008 11:25 AM User is offline

I have a 2000 Z71 that is doing the same thing, compressor stops going down the road. Rev the engine and it may or may not reengage. Leave it off for a bit and it will start working again.

How do I adjust the clutch?

Jimmy

Chick on Sat May 31, 2008 3:28 PM User is offlineView users profile

GM tech, Delco shows the 99 5.3 to use the H compressor, is that a mistake??

jimmycox Z71 is the trim option I think, what platform for us guys that aren't into such things? Like Full size truck, mid size, S series??

If they have the HT 6 compressors, follow this procedure listed in the front seal removal, there is a section on installing adjusting the clutch and also part numbers for the tools you'll need.
If you have the Denso type compressor as GM tech suggests, then remove the small center bolt as he said and remove a shim..

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

GM Tech on Sat May 31, 2008 7:06 PM User is offline

Yeah , I blew it-- thought it was a 2003 or so-- 99 was still H-6-- not a Nippondenso-- so just reset the airgap.....

-------------------------
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......

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