Any vehicle with any kind of electronics in the heating controls wont let you set it to recirculate air when it's on defrost, because it can't defrost using the same humid air thats already inside the car.
Plus, if the windows were already clear when you started out in the winter, setting the heater to recirculate would quickly fog your windows up. You'd notice very soon in this weather if you accidentally set your heater to recirculate while you are inside.
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