Went to turn on the AC today and No luck <img src="/forums/images/graemlins/confused.gif" alt="" /> only hot air coming out. Opened up the hood and took a look to find the compressor clutch not spinning. I checked the connection to the clutch and everything looked good. I just had some work done on the truck and am wondering if they hit something by accident. I check and I am not getting 12v to the connection going to the compressor when the switch is on. Is there a relay or pressure switch in the system that might be bad? I have never had a problem with it before. I am kind of lost on this one any help would be great as I am sweating my <img src="/forums/images/graemlins/butwiggle.gif" alt="" /> off

Same here. went to napa and bought a 134r kit and followed the directions. if your system is MT, the pressure sensor will not allow the clutch to engage. once it sees psi, it will click on. FYI, get a kit with the longest hose available since the ports are a little hard to get to. cant remember the brand i used "AC Pro??. mine works just like the glossy Mitsubishi brochure.

Jump the compressor clutch from the battery and see if you get cold air. If not it's low pressure, if yes then a electrical somewhere.

If it's not the combo switch (lo and hi pressure cutoff switch), I wish you a lot of luck. I'm used to wiring diagrams and I get crosseyed and discombobulated trying to trace out the wiring paths in the a/c system...