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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.


Fog buildup occurs on your car windows the same way it does on the glass of a cold beverage. The different extremes in temperature, whether it exists on the inside or outside, cause moisture to condense on the coldest surface - in this case, on your car windows.


To keep your car windows from fogging up, there are three basic things to consider: how to prevent it, how to reduce it if it occurs, and how to remove it once it is there. You can help prevent fogging by reducing the amount of moisture in the vehicle. Although some may still occur, you can minimize ...


The windows in my car get foggy too, sometimes. It depends a lot on the weather and also the people inside and whether the air conditioning/heater is running. Car windows fog up when water condenses on them. This can happen both on the inside of the window and on the outside.


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.


Any warm moisture from inside the car which comes in contact with the cold glass, will cause condensation and fog your windows. If the outside air is hot, and you turn on the AC, you have the opposite situation. The hot outside air meets your cooler windows resulting in fog.


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…


May 11, 2017 - Windows fog up on the inside when warm, moist air in the car meets colder glass surfaces, causing condensation.


But just within seconds it just started to build up outside again. I then had to keep turning on the windshield wipers every minute. I looked at other cars around me and checked the weather outside, but the other cars were just as fog free as my car and it wasn't that cold of a day nor was it raining. Please help on what may be causing this!