Why does the inside of my car window fog up when I'm driving?

It's been pretty cold when I live. Tonight, it was raining while I was driving and when I was driving on the street, my window started to fog up on the inside. I COULD NOT SEE ANYTHING. I had the heat turned on so could that be why? This was really scary I had to stop on the middle of the road and wipe my

It's been pretty cold when I live. Tonight, it was raining while I was driving and when I was driving on the street, my window started to fog up on the inside. I COULD NOT SEE ANYTHING. I had the heat turned on so could that be why? This was really scary I had to stop on the middle of the road and wipe my windows cause it was so blurry. Any reason why this may happen?

Best Answer:

Braelyn: It happens because the air inside the car is so much warmer than the air outside. That's why even though you're supposed to use the heater on defrost, it doesn't always work very well. I use the AC on the coldest setting, in the defrost position. You'll be cold for a minute or two, but the windows will clear up.

Other answer:

Braelyn:
Normally you need to turn the heat on and make sure it's aimed at the windows if you don't have heated windows. In my experience sometimes you have to drive a for a few minutes at least to get the heater temperature up enough to clear the windscreen, or wait long enough while parked.

I don't get the cold air comments. I am talking about a cold, damp, even heavily iced window situation. Why would you want to turn on cold air? I guess as long as cold air is warmer than that outside it has the same effect as warm air -but you'll want to be warm in the car anyway? So use warm! It will clear the windows faster too?

thebax2006:
If you have the air intake set to recirculate the humidity in the passenger compartment causes the window to fog up. Set the air intake to fresh air. You can also run the AC with the heat at the same time as long as you have the air vent position set to the floor and defrost. many cars won't let the 'ac run if the air flow is only set for the windshield/defrost by itself. Cracking the windows also helps reduce inside fogging.
OlifantJagter:
When this happens do NOT turn the heat on. It is because of the difference in temperature from outside and within your auto. Turn on the AC (Air Conditioning) to make the temperature somewhat closer to that of outside. It is fogging up because the outdoor temperature is cold, and your auto temperature is warm/hot. Be careful, this happened to me once when I first started driving on the highway and it scared the shˆt out of me.
Ron:
defrost and if your a'c light doesn't come on automatically, turn it on. It dries the air
Skoda John:
Keep your demisters going and the AC ON.
The AC dries the air.
ken613uk:
There is an old-fashioned and, to modern drivers a revolutionary idea. It is called "opening a window"
Rachel:
Turn the defrost on.
Emily:
turn on cold air

Leave a Reply