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2003 se AC problem

Shadowchaser

Shadowchaser

New member
The AC in my 2003 Grand Prix se stopped working. I had it to an AC Shop and the tech checked the freon charge(which is fine). When he jumped the AC compressor clutch OR pressure valve the clutch would engage and the AC blew cold air. The system would over pressure if he didn't remove the jumper. The cooling fans on the radiator also would start and run, but not on high speed. He recommended changing the AC high/low pressure switch(which I did) and or a module under the dash(which I cant find). I checked/changed the relays under the hood and fuses under the dash and hood, as well as the diode. I don't have any add on accessories( still has factory stereo) and the wiring harness has never been touched, and not having any other electrical issues.The LED on the dash control lights up when I push the button or turn the knob to MAX . I also dont hear the relays clicking in the junction box when I turn the AC on. Everything on the heat side is working correctly along with the blower
Thanks in advance Scott
 


Usually if the pressure builds too high and the switch kicks it off, then I believe that is a compressor or blockage issue.
 
Check for blockage by observing the rate at which low and high side pressures equalize after the compressor has been on. High side should reach at least 200 psi.
 
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