AC on all the time....HELP

[steves1967]

I've got to figure this out and don't know where to begin...90 burb front and rear AC. The plug under the hood, that connects to the compressor is all burnt up, when i do plug it in (rig it), the compressor starts running, even if the dash controls are off, or set on "heat". The damn compressor runs all the time- I notice a burnt wire smell, and saw smoke once in the truck when i plug the compressor wire into the compressor and drive around town- where should i look for the problem?? Thanks-Steve

[Grim Reaper]

That wire runs from the compressor back to a plug on the fire wall. From there it runs over to the relay pack on the AC box. Either there is a problem with that relay, problem with the controls on the dash OR somebody hacked up the wiring and hooked that lead straight to hot. If they went straight to hot they probably did it right there on the fire wall on the junction block over the driverside valve cover.
Bestthing to do is pick up a Haynes from the auto parts store and it has the wiring diagrams and and diagnostic info on the A/C.