Join Date: Dec 2000
Location: Monroe, WA, USA
well guy's it might not be a leak in the heater core.
when we breath we give of..............H2O!
in a cold dry climite it can freeze or well linger. when you get going you make it come out and it love's that cold window!
this is most comon with a car with A/C, you get it traped in the heater box. the A/C evaporator draw's H2O out of the air and it is suposed to drain out a drain hole in the heater box, well that hole can get pluged and it will sit in there and come back and get you latter.
the same thing happen's in a non A/C car, just it is not as pronounced.
a heater core leak or a window leak are other thing's that can cause this, a bad door seal too.