How to Solve Fogging on the Windshield When Using Air Conditioning in Summer?
3 Answers
Fogging on the windshield when using air conditioning in summer is a normal phenomenon. While driving, you can slightly open the windows to ensure air circulation inside the car, balancing the interior temperature with the outside temperature. This will cause the fog on the windows to disappear. Here are solutions to address fogging on the windshield when using air conditioning in summer: 1. If the windshield fogs up, you can use a defogging spray on the glass and wipe it with a clean towel. The fog will disappear as the spray forms a thin protective film on the glass, effectively preventing moisture from condensing and forming a fog layer. 2. Generally, there is a dehumidification switch on the car's dashboard. You can also use the car's dehumidification function to remove fog. If this method is not very effective, it is best to lower the car windows.
Driving in summer with the AC on often leads to frustrating fogging on the rear windshield. I've encountered this many times—it's usually caused by warm interior air condensing on the cold glass. The solution is straightforward: immediately press the defogger button on the AC panel (the icon looks like a car window with airflow), switch the air vent mode to windshield airflow, and increase the fan speed. Using the external circulation mode is best to draw in dry outside air for dehumidification, or switch to cold air to reduce humidity. Additionally, wipe the inner glass clean before driving to remove dust; if fogging persists, check if the AC cooling is functioning properly and avoid setting the temperature too low to prevent excessive temperature differences. Regular maintenance, like cleaning the AC filter during car servicing, can also help prevent this issue.
When fog appears, I first turn the fan to maximum speed to blow air onto the windshield, adjusting the vent direction control to the widest angle toward the glass. Using the external air circulation mode quickly introduces dry air for dehumidification, as internal circulation may cause humidity to rebound—try external first. Then press the defogger button (usually marked with a fan-shaped symbol), which works better when combined with cold air. Remember to regularly clean the inside of the glass, as dirt can trap moisture and lead to fogging. For troubleshooting, check if the AC system has leaks or a clogged filter—high humidity in summer often causes this issue. Address it promptly to ensure clear visibility and safe driving.
