It’s common (at least in my experience) for windows to fog up when a car has been sitting around at night not being used, or when the air conditioning has been running and it is warm outside, and then the A/C is turned off or set to a warmer temperature. In the first instance the fog is on the outside of the windows, in the second the fog is on the inside, but in both cases the quickest way to get rid of it is to turn the system to defrost and the temperature to high to warm up the windows and get rid of the fog.
In your first condition, you will find that the fastest way to rid the outside of the windshield of condensation is to turn on the windshield wipers. If it is the back window that has condensation, use the rear window defoger switch. If your side windows have the problem, roll them down and back up again, the scraper molding on the top of the door will clean the water right off. Furthermore if you go back and read my explanation, you will see that an A/C compressor will not operate when it is 20F outside due to the low temp. When it is approaching 100F this is not an issue, and the A/C evaporator can easily remove the water from the air.
For your second case, why is water condensing on the inside of your windows? If your A/C is operating there should never be anywhere near that much humidity in the air inside the car. If you really do have this problem with your car, may I suggest a visit to a shop is in order, you may have a leak in your heater core.
Getting back to how the system works it is designed to deFROST your windows, and the word frost implies cold. When it is cold outside the outside air is drier than the warm humid inside air. This is how the system works. Deal with it. Or move to a drier climate.
I’ve found that windshield wipers just smear the condensation, not making it any easier to see; ditto rolling down the windows (in fact, with my new Civic, rolling down the windows does nothing; it won’t even remove raindrops).
The windows get cold from the cold air blowing on them, and then when warmer air starts blowing it condenses on the windows. I’ve had this happen in several cars, ranging from an ancient Chevy Nova to a brand-new Honda Civic. I don’t think it’s a problem with the cars.
Hello Rick, Is it possible to have you talk to me through email? Thanks purpledragon
Why don’t you try a Private Message? You’re in luck, Rick is cold, but still around after 5 years!
Feel free to send me a private message or drop me an email, my addyl is in my profile.
Rick.
I just sent you an email thanks