Hello! First I want to say thank you to everyone here, I have successfully solved many problems on my 00 V8 LS. I have a new problem that I am hoping to get help with. I have searched and read several threads but I am not finding a solution or next step. The air conditioner does not work. I borrowed a set of gauges to read the low side pressure, it measures 0 pounds, and yes it was connected properly, when I turned the valve I heard gas moving and the needle twitched. The compressor does not turn. I put a 12oz can of R123a with dye in it to identify the leak, and have not been successful. When I disconnected the can it sprayed some refrigerant and dye around the low side inlet valve, and that is the only place where there is dye, and it sure looks like it was my disconnecting it that caused the dye, not an actual leak. The compressor still does not turn. I have run the climate control diagnostic and it reports no codes. The fact that the the AC blew cold last time I tried it 6 months ago, but now has no refrigerant points to a catastrophic failure of some kind. The air coming out feels hot to me. Here are my questions. If the compressor won't turn, then refrigerant won't circulate, how do I find my leak? When compressors fail and stop pumping, do they also start leaking? It seems wierd I have 2 simultaneous and unrelated AC problems. The air feels hot from the vent on AC, which points to a bad DCCV, did my whole AC system just implode at once? Some cars compressors will not turn on without enough refrigerant, is the LS one of them? Is there a way to prove the compressor is the broken before I start throwing parts at the problem? Is there a particular spot in the AC system where leaks are more likely? The engine bay is crowded and it is hard to examine all the lines, a hint would help. I would really appreciate any advice. Thanks!