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ljackson · 05-28-2010, 01:05 PM

Hi, I have a 99 Yukon with a 5.7. The A/C is not working. The clutch will engage and turn the compressor if I run a jumper wire to the front plug. It does get cool. I read about a sensor that may not let the clutch engage due to low freon, hi or low pressure. I am not sure where the sensor is. While I had it jumped, I added a small amount of freon. The gauge was pegged when I first started. Now it is reading about 50 psi. When I reconnected the plug, the clutch does not engage. I did not find anything after searching with my exact problem. Is there a sensor that may have gone bad? Where is it? Can I replace it?
Thanks for your help

05-28-2010, 01:05 PM	#1
ljackson Registered User Join Date: Apr 2009 Location: Amarillo, Texas Posts: 636	A/C problem Hi, I have a 99 Yukon with a 5.7. The A/C is not working. The clutch will engage and turn the compressor if I run a jumper wire to the front plug. It does get cool. I read about a sensor that may not let the clutch engage due to low freon, hi or low pressure. I am not sure where the sensor is. While I had it jumped, I added a small amount of freon. The gauge was pegged when I first started. Now it is reading about 50 psi. When I reconnected the plug, the clutch does not engage. I did not find anything after searching with my exact problem. Is there a sensor that may have gone bad? Where is it? Can I replace it? Thanks for your help __________________ Father and son built. Driven daily since 2012. 283, 3 speed. Mostly original. '81 PS and disk front. Fuel tank relocate. Maintenance, repairs and upgrades on his dime now. http://zacks64longfleet.shutterfly.com/ Higher res. photos in my gallery.