Fogged windows?

Question

why do my car windows fog up at night when the windows are closed and the perspiration is on the inside? I dont get it

Answer 1

The humidity levels inside the car build up from water/snow on the floor and condense on the windows because the glass is cooler from the outside air temp than the inside of the car. Try leaving a window open a crack when parking to allow inside humidity to escape and equalize with outside air. Wiping windows down with white vinegar helps also.

Answer 2

you probably have your htg & ac set to recirculate (this keeps the air in the cabin on constant recirculation).  Change this setting to outside air (this allows outside air into the cabin and vents the inside air out).  This should stop the fogging and you will not have to travel with the windows down.

Answer 3

Running the "defroster" and windshield wipers usually cures that problem.

Answer 4

Because the windows are cold and the warm moist air inside the car condenses on them. It's the same reason that your bathroom mirror fogs up when you take shower. If you are inside a car at night and the windows are fogged and you "don't get it", I can assure you that you are about to "get it" because chances are very good that at least some of your clothes are in a ball on the front seat, your blouse is unbuttoned, your bra is unhooked... I better stop describing this or I'll never get any work done.