Hey Heatchaser sounds like you've covered alot of ground but I can tell you from experience that replacing AC compressor didn't help my overheating issue. I recently replaced water pump, fan clutch, radiator, thermostat, hoses, belts, pulleys, everything except condenser and heater core. The condenser will be my next step though. Right now I'm battling ebcm faults. Good luck and post a fix if you find it.