5 Apr 18

2000 Chevy Silverado 1500 2 wheel drive, Ext cab, LM7 (5.3 ltr ), Automatic, Vin "T", 86K miles.



My truck has been parked outside in the Arizona heat for about a year. During that time I've probably put a few hundred miles on it. It's our 3rd vehicle and seldom used.

I took it to the lumber yard last week and the drivers door window would not operate. Needless to say, I had to replace the regulator. Works perfect now. So because the window was in the up position, I turned on the A/C.

Nothing happened except lots of hot air blew into the cab. It was working fine just a couple weeks ago. It made no sounds, or showed any symptoms of not functioning as it should at that time.



So I've been researching possible causes and determined that the Compressor Clutch was not engaging at all. I swapped the relays in the under hood fuse box and still nothing. Today I tried a jumper across #87 and #30 in the relay socket and the clutch clicked on and then off as I removed the jumper. So it's not a Compressor Clutch problem. There was no feeling of cold in the A/C under hood line to the condenser and no feeling of heat on the other A/C line running from the condenser. Had the compressor been functioning, they would feel cold and hot to the touch depending on which line you were touching.

I do not have a set of A/C gauges to check the refrigerant pressures, so I don't know if the refrigerant is low (or gone) because of a leak?? I checked all of the fuses that might have anything to do with the A/C system working and all are fine.



So I'm open to any suggestions that any of you may have for me. Is there another type of test I can perform to see what might be wrong. ?



I always do my own automotive work. I do not want to take it to a shop unless I have a very good idea of what the cause of this problem is.



I sure don't need some guy telling me I need to tighten the A/C "Kanutin Valve" or change my "Directional Fluid" if you know what I mean.

All replies will be appreciated..



Keats

Phoenix