In my Contour, the air conditioner is on in the defrost mode when the
temperature is above 50 degrees F. This is because when you cool the air,
you also dry the air. The dry air helps defrost the windshield. This is true
in the defrost/floor setting, but not the console floor setting. So anytime
air goes to the windshield, it is cooled if the temp is less than 50 degrees
If you need the defroster and it gets to cold in the car, just turn up the
heat a bit.
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