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On a hot, humid day, the opposite happens, when the muggy air outside your car reaches the dew point against your windshield after it’s cooled by your AC system. Whether the fog is on the inside or the outside of your windows, any time you can’t see clearly in all directions, it’s potentially dangerous.


Why Windshields Fog Up. To find the best solution, let’s take a closer look at the problem – fogging. Windshield fogging is caused by water vapor condensing on the inner surface of the glass on a windscreen. It can happen one of two ways. The first way begins with air that gets trapped inside a car from the previous day.


Ugh! Why do my car windows keep fogging up?! We've all been there. You jump into your car and within a few minutes of driving the windows are so fogged up inside that you're looking at the world ...


Driving with a foggy window can be irritating, not to mention dangerous. According to the UIUC Department of Physics, car windows fog up when water condenses on them, occurring on the inside and outside of the window. Learning how to properly prevent your windshield from becoming foggy is a must if you want it to stop fogging up.


Written by Anthony Volk on October 31, 2017.Posted in Auto Glass Care Tips. 4 Reasons Why Your Windshield Fogs Up. You’ve likely been there. You jump into your vehicle and after you’ve been driving for a few minutes, your windows beginning fogging up.


Windshield fogging is caused by water vapor condensing on the inner surface of the glass on a windscreen. When the more humid air inside the car comes in contact with the cold windshield glass it releases some of its moisture, leaving condensation or fog on the glass. The other way is caused by us.


Anytime I drive my truck for more than 10 minutes the entire windshield fogs and whatever is causing it is coming from the defrost vents on the top of the dash. I have been driving with a old shirt stuffed down the drivers side defrost vent so it won't fog up the drivers side, that way I can still drive it. What is causing this, whatever coats the windshield takes extreme scrubbing to get it ....


The windows in my car, a 1997 Cougar, have recently started fogging up inside. It only started doing this for the past week week and a half. I've checked the carpets and they're all dry. My car is the only one in the par…


A reader wrote us this week and asked BestRide why her interior windshield glass is always foggy. No matter what she does to clean it, it seems like the glass is foggy a day or two later. We know just what she means. We auto-reviewers are frequently in new test vehicles and indeed, the windshield, and other glass is always foggy.