Quote:
Originally Posted by Doctordestiny
Aren't you supposed to keep your heater on recirculating like almost all the time. That's what I do because that's what I've been advised to do and then it's heating air from within the car and this problem wouldn't happen. I only set my heater to heat outside air when I know the vents are plugged which, as I recall, has probably never happened in the last several years because I try to keep the outside vents clear. My car is garage parked, which also helps.
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No, you should pull in outside air. When your windows start fogging up, it's because the inside air has become more humid. The outside air in winter is very dry, so replacing the inside air with outside air is key. If you recirculate then all your doing is letting the inside air getting more humid. Your car shouldn't have a noticeable difference between recirc and non-recirc in terms of heat output. I only use recirculation in the summer when driving on gravel roads to prevent dust from entering the vehicle.