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Fyi, too close this out. My local professional mechanic I use when I get stuck spent several hours on this and thought it might either be pcm or a wiring. He finally found and fixed wiring issue. Car had some front end damage before I got her. 3rd wiring problem that had to be fixed...

Thanks, but if I wanted take it somewhere I would not have bothered to post. Ive gotten some useful advice from the posts here in the past. I was hoping for more. I've already checked pressure which is ok. it runs cold by just jumping the relay. id think that the root case must be on the...

I have a 2004 LS V8. I love this car. Great performance and soft ride. Just what I wanted. Unfortunately, it has quite a presonality with some quirky issues I've been dealing with - mostly HVAC system. Powertrain has been solid.

I can get the AC to operate if I jump the clutch relay - AC Clutch engages and I get cool air. The wiring diagram shows the AC clutch is grounded through the PCM. I notice the radiator cooling fan does not turn on when the AC system is turned on. Can the cooling fan be bad and the root cause...