Ok, so where do I start... how about here:
I have had the system recharged, and it was 3/4 pounds low on R134A. Refrigerant, UV leak detector and PAG 100 oil was added. Now the cold air is very cold, but then goes back to very warm air.
I have jumpered the single pressure switch to allow the condensor fans to remain on the normal low speed and jumpered the dual pressure switch so the compressor will stay on.
I have replaced the clutch.
I am confident the squeal is my old and dry serpentine belt that will be replaced tomorrow.
New pressure switches will be here tomorrow or the next day (Rovers North is the best place for those, btw).
Here is what is happening: Air still goes from warm to cold, BUT I KNOW WHY: the clutch constantly engages and disengages. So I can rule out the dual pressure switch because it is out of the circuit completely, same to single pressure switch. I know for a fact it is not the clutch because a) there is a new one and b) I am losing voltage on pin 7 at connector C202 which is inside the pass. kick panel. That is why my clutch engages and disengages.
So why? My "service engine" light is on, but it came on at 82k-ish miles, and I have 85k on it...that should be normal, right? All the light does is tell you its time to give your dealer some money at 50k and 82k...or is it?
I now have 2 theories:
1) there is a componet that is loading the engine down so it tells the BeCM which tells the HeVAC that it doesnt have enough power to run the A/C and turns it off 2) my HeVAC is screwing upI have not checked my A/C charge so there is a chance it could be low, but that would be determined by the dual pressure switch that is out of the circuit.
I did note that I was getting 12.5 (+/- .5 volts) at the clutch and I was getting 13.2 volts at the connector in my pass. kick panel.
I have service manuals and the ETM (RAVE CD actually) but I can not figure out where to troubleshoot next.
Surely somebody out there can help me!
Dave snipped-for-privacy@mac.com