What Causes Car Windows to Fog Up Continuously?
2 Answers
The root cause is that the external temperature is relatively low, which makes the temperature of the front window low. When the temperature inside the car rises, the air inside the car condenses into small water droplets upon contact with the windshield, adhering to the glass, thus resulting in the 'window fogging' phenomenon. 1. Temperature difference between inside and outside the car: The temperature inside the cabin is higher than outside, causing the moisture inside the cabin to condense on the windshield, forming fog. 2. Additional information: Solution: Wiping the inside of the windshield with a cloth dipped in dishwashing liquid or a special anti-fog agent can effectively prevent window fogging. Wiping away the fog with a cloth is a temporary solution, as the moisture will quickly condense into fog again.
I've got plenty of experience with foggy windows. The most common cause is temperature differences – like when it's warm inside the car in winter but freezing outside, causing moisture to condense on the glass. High humidity after rain or car washes is another major contributor. Sometimes my car's ventilation system isn't enough when set too low; I need to turn up the fan or use the AC's dehumidifier for it to work effectively. More passengers breathing adds to the problem too, especially when traveling with kids since their heavy breathing makes fog form faster. My routine is to activate the defogger before driving or crack the windows slightly for ventilation – this trick works well. Also, keeping wet items like umbrellas or damp jackets out of the car prevents a lot of trouble. Foggy windows dangerously obstruct visibility; if you can't see clearly, always pull over to handle it properly.
