2002 Cad Escalade - No A/C Unless Relay Jumped

[AFFORDABLEAUTOREPAIR]

NO A/C, CAME INTO THE SHOP WITH BROKEN TENSIONER. REPLACED TENSIONER AND BELT, HOOKED UP GAUGES CHECK PRESSURES. IF I JUMP RELAY, COMP ENGAGES, BLOWS COLD. A/C BUTTON LIGHTS UP RECIRC LITES UP AND SCANNER HAS NO CODES. SCANNER WILL SHOW A/C REQUEST WHEN TURNED ON BUT NO CLUTCH ENGAGEMENT.

[liljoe]

A couple things come to mind, one is reseting the truck with a battery disconnect, prob not the answer, I would also look at the a/c pressure PIDs on the scanner and see what they are reading. might have knocked a pressure sensor connector or wire off, or poss broke a pressure sensor. Seems the best I can remember that the high side pressure transducer is mounted to the line right near the belt,

[steven kiser]

fuse? was the battery disconnected or worse vehicle driven until it died?

[ricmorin]

Check for codes? I remember some of these setting a code for low pressure and locking out the compressor until reset.

[steven kiser]

Check for codes? I remember some of these setting a code for low pressure and locking out the compressor until reset.

agreed, some will set code without the light coming on and if not cleared the compressor will not engage.