#132616, "RE: Car is eating thermostats like skittles" In response to In response to 11
Originally posted by RoninEclipse2G Actually the car will cycle the AC with the defrost on anyway to help control the humidity inside the cabin. I had been wondering for a while why my gas mileage kinda sucked when I ran the defroster compared to when I would just crack the sunroof and blast the heater on my feet. I finally let the car sit and idle with the defroster on and I watched the AC compressor kick on and off.
My car does not cycle the A/C with vent selector in defrost mode. I would definitely know because I often leave the vent in defrost mode and the A/C compressor causes wicked oscillation in my MS2 controlled stepper IAC (it will stall the car after a while). The 1995 had a different control system for the A/C. I have the weird three position "snow flake" button. In any case, leaving the A/C button depressed in the winter will certainly tend to overcool your radiator. The thermostat should still be able to accomodate that and direct flow away from the radiator to maintain temperature.
