Should You Use Cold or Hot Air to Defog Car Windows?

1 Answers
AmirRose
07/30/25 10:22am
If the external temperature is high, turn on the cold air and press the one-touch defrost button for the windshield to eliminate fog. If the environment is cold, turn on the warm air, set the fan speed to maximum, and also press the one-touch defrost button for the windshield—the fog will disappear quickly. Reasons for fogging in rainy weather: Fogging occurs on rainy days due to high air humidity and a significant temperature difference between the inside and outside of the glass, causing water vapor to condense on the windshield. Therefore, if the vehicle is equipped with a manual air conditioning system, turn on the front window defogging mode, set the fan speed to maximum, switch on the A/C, and adjust the temperature to the lowest setting—the fog on the glass will soon dissipate. Automatic Air Conditioning: If the vehicle is equipped with automatic air conditioning, usually just pressing the one-touch defrost button will quickly remove the fog.
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