You could try bypassing the Trinary switch which will determine if it is faulty.
Also, if the Trinary switch is working, the pressure may be either too high or too low.
Permitted operated range is between 29 - 464 psi
Trinary, that's the word I was thinking of. That's the thing with 4 wires coming out of the bottom into two plugs and located on the A/C line near the dryer right? How would I bypass it? Plug the two plugs together? I've read about someone jumping the C4 fuse to test the compressor itself which I might try.
2005 Elise, Nightfall Blue