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1999 Silverado Compressor shutting off...still

jgcox6 on Tue June 03, 2008 8:10 PM User is offline

Year: 1999
Make: Chevy
Model: Silverado
Engine Size: 5.3l

Hey guys, here I go again. If you don't remember,,it was cycling on and off and the last post I did, you guys suggested that we adjust the compressor clutch gap. We adjusted the gap per "Chicks" credit card suggestion. It still shuts off after just a few minutes. We then replaced the low pressure switch and it still switches off. We can bypass the low pressure cutoff switch and of course it freezes up eventually. The thing will freeze you out of there when it is on! We don't have any signs of a leak or anything and need some advice. Help a brother out again....

jgcox6 on Wed June 04, 2008 1:11 PM User is offline

jgcox6 on Wed June 04, 2008 1:24 PM User is offline

Sorry Chick...I actually meant business card.. not a credit card. We did use a business card and adjust it in. I knew you were going to say check the levels and give a report....YES SIR! I will return with a full report...might even tell ya what I had for supper! I am for evacuating and vacuum and recharging just to know for sure where we are. Thanks again and will be yaking back at ya.

Chick on Wed June 04, 2008 7:28 PM User is offlineView users profile

Check the clutch gap (ok you did that) and pressures before you evac/recharge, it may be something simple... (pressue low side is cycling off on) possible a bad switch.. But your idea of evac/recharge to know what is in it is a great idea, so many don't want to go thru the hassle, so it's always guessing...Good luck and let us know...

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

jgcox6 on Thu June 05, 2008 8:29 AM User is offline

I need alittle clarification just to make sure I am doing the clutch gap correctly....I slide the business card in between the pulley and the front of the compressor...and it is kinda snug fit..Is that all it is to it. We used the GM clutch tool to "push" the gap closer. Up to that point I had never used one of those tools. So just a step by step...tell me if we did it right please. (1) screwed the tool onto the smaller threads on the inside of the compressor pulley. (2) then once that was snug..screwed the bigger nut on the tool into the bigger threads. At this point was thinking that the gap was being closed???...is that right. We kept tightening that until the card was "dragging" when we pulled it out. Sound right to you..

GM Tech on Thu June 05, 2008 9:25 AM User is offline

You have a puller/installer tool- you ony ever screw onto one set of threads at a time- to push it on-- screw onto the shaft threads--- to pull it out- scre into the clutch driver threads-----never screw into both the shaft and the clutch driver threads at the same time- you will break your tool!! look at it closely and you will soon undersatnd what I am saying. You should have about .020" inches gap if you use a set of feeler gages.... the factory spec is .010" to .040" gap

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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......

jgcox6 on Thu June 05, 2008 10:10 AM User is offline

Forgive me for being a knucklehead....we screwed the center part of the tool onto the "shaft" of the compressor...(is that right?) w did that thinking that was just to hold it in place. Then we screwed the outside nut of the tool...thinking that was pushing the gap closer together...is that right? we never screwed them both at the same time...trust me I am thick..so explain it as basic as you can..and thanks for replying...

GM Tech on Thu June 05, 2008 10:15 AM User is offline

sounds like you did it right- as long as you got the final gap right is all that matters..

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

jgcox6 on Thu June 05, 2008 1:30 PM User is offline

thanks and will let ya know what comes out of tonights readings....

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