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just quit ....

jamamar on Wed July 16, 2008 9:48 PM User is offline

Year: 2003
Make: Chevy
Model: Silverado
Country of Origin: United States

2003 Chevy Silverado, while traveling at highway speed stopped working on way to work. Prior to and on the way it was ice cold. 5.3 motor. I have checked
the fuse, and the relay. I put a guage on the low pressure end, and the reading went well past over charged. Can't tell if the clutch is engaging, as the unit is on the bottom side the motor. any ideas?

chris142 on Wed July 16, 2008 10:16 PM User is offline

Belt still on it?

jamamar on Wed July 16, 2008 10:18 PM User is offline

yes...1 serpentine belt.

chris142 on Wed July 16, 2008 10:22 PM User is offline

Uhhh.

The truck has 2 belts. The main one and a much smaller one that runs the AC only.

jamamar on Wed July 16, 2008 10:27 PM User is offline

well I feel stupid.....is the smaller belt visible from the top ? and if this was gone, would my low pressure reading on the guage be thru the roof ?

chris142 on Wed July 16, 2008 10:41 PM User is offline

If you look hard enough you should be able to see the pully.

Or take out your 15mm socket and pull the plastic splash pan off. If the belt is gone or came off you gotta take the Splash pan off anyway.

If it's off and it throws it again the compressor is dying................Very common problem with those trucks, should have about 86,000 miles on it lol. Thats the milage I see on many I fix.

If the belt is gone the compressor ain't turning and your low side pressure will be near the outside air temp or even higher since it's so hot under the hood.





GM Tech on Wed July 16, 2008 10:54 PM User is offline

Last one I saw with this symptom was a wide air gap- truck had lots of miles which equals lots of cycles- which means lots of wear- I bumped the clutch while engine was running- it engaged- so I took the clutch bolt out and removed a shim- and all was fine- saved the owner the $650 quote he had for a new compressor- plus I am on a roll- have diagnosed at least five wide air gaps in the last two weeks....

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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......

Edited: Wed July 16, 2008 at 10:55 PM by GM Tech

jamamar on Thu July 17, 2008 4:59 PM User is offline

Well, the belt is still there. The clutch as far as I can tell is not engaging. All known fuses and relays checked ok. Today when I turned on the a/c teh fan blew thru the defrost vent for a while, then switched over to the dash ?

GM Tech on Thu July 17, 2008 10:49 PM User is offline

So---- did you bump the clutch while it was running?

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

jamamar on Sat July 19, 2008 3:09 PM User is offline

no i didn't ......however on the way home last night, after blowing hot air for almost a week, ice cold air came out for a while then went a little warmer. Eventualy it went hot again, then started cold...........wife has it today, so not sure whats going on now.

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