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Posted by eclipsed123, Jul 4, 2012
Newbie Forum - Beginner/newbie/general DSM modification questions. First mods, how to run 10's when you haven't run 12's yet, any tech question that doesn't fit in another tech forum.
x2 i had this problem before on a 91 mustang gt.
The manifold gauge indicated that the pressure was high. I would suspect a bad pressure switch, wiring to the switch, a bad compressor clutch, or wiring to the compressor clutch.
is there a way to (hotwire) the compressor to see if it will turn on and get reading from there if it does? or is that a bad idea? this is interesting.. im learning something from this thread as well and more info will help the o.p. in the end
Yes, you can jump the relay, or just add power directly to the plug. Jumping the relay is the best idea because it will verify that the wiring from the relay to the compressor is good. It would be a real good idea to have your gauges hooked up while doing so to see if the high side is maintaining a constant pressure and that the low isn't being pulled to nearly 0 (a result of low refrigerant). It can damage the compressor if the system is ran with little oil and refrigerant for very long though. This would of coarse just be a short test to check for proper operation of the clutch and to verify that it is a possible problem with the low pressure switch or circuit.
Here is the links to the service manuals, they may be of some assistance here.