Thanks for the replies. My transducer has continuity, 5v ref, & good sensor so I believe that area is fine. I don't know for sure, no scan tool to see what's going on in there. As for the diode, it probably is one. I wouldn't know the difference. Just some small little electrical thingy. Lol. Gu...

Do you have access to a GOOD scan tool? If so, scan it. Check for ac request signal, air intake temperature, & a/c pressure. The expensive (good) scan tools can even override the pcm and turn on the compressor to check for functionality. Even if the system is okay, the pcm won't allow it to oper...

Experts needed: My car is a 2004 Cavalier. I've replaced the compressor (reman), oriface, high/low pressure sensor and receiver/drier along with throughly cleaning the rest of the system. I've tested all the wiring from the pressure sensor to pcm, compressor to relay, relay to fuse, fuse to batt, re...