What is the reason for the windshield still being unclear after turning on the air conditioner?

1 Answers
OCharlie
07/30/25 9:26am
The reason is the temperature difference between the inside and outside of the car, which causes water vapor in the cabin to condense on the inner windshield, forming fog. Here are some methods to solve car glass fogging: 1. Air conditioning defogging: Turn on the front window defogging mode, set the fan speed to maximum, and turn on the A/C switch while setting the temperature to the lowest. Additionally, some models are equipped with electric heating for the rear windshield and side mirrors; simply press the switch, and the fog will be eliminated in about a minute. 2. Air convection: Opening the windows can increase air convection, reduce the temperature difference between inside and outside the car, and weaken the conditions for fog formation. However, this method is suitable for very few situations. 3. Defogging spray: Spray it evenly on the glass surface and wipe it clean with a dry towel. Its principle is to use surfactants to leave a protective film on the glass surface, altering the surface tension of water molecules, causing fog droplets to coalesce into larger droplets that do not obstruct vision.
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