Why do the inside of my windows frost up?
 

It's not an old car - 2005 - but my inside windows keep frosting up...why is this?

The glass is below freezing, and your breath is above freezing. The humidity in your breath is freezing on the inside of your car windows.































Try not to exhale in the direction of the windows until the car warms up.

I have a female friend that I get after all the time. She is cold in the car, so she found out she could shut off the flow of air by turning the heater control to "recirculate" and turning the fan to "off". It is a two way lever on the dash of many cars. If you have one, set it so it allows "incoming air" or "fresh air" . It usually shows an arrow coming "in".















The problem is you have high humidity in your car. This is caused by melting snow, rain or some such thing. It might even be the sudden temperature change. Like, Friday is was 50 and raining, you parked the car, and Monday it is 20 and snowing. You still have your moist air in the car. Once that moisture hits the cold glass, it will condense. If it is cold enough, it will freeze.















Solution: dry your car out. Run the heater (fresh air in) at your feet, and drive around with the windows down. You want that cold, dry air to pick up that moisture and get it out. You can alternate windows up and down. If your floor mats are soaked, take them out and dry them.















It may take a while, but once you get the car dry, put down removable rugs or newspaper, so it will absorb the melted snow/rain water from your shoes and you can easily remove it. Keep the lever in "fresh air" and keep the fan on a little. The system is set up to exchange the air, if you let it do it's job.