How to Solve Fogging When Turning on the Air Conditioning?

[DelBrayden]

Solutions for fogging on the windshield when turning on the air conditioning: 1. Open the windows: In cases of mild fogging, slightly opening both side windows to allow air circulation can eliminate the temperature difference on both sides of the windshield, naturally preventing fog formation. 2. Use the blower: Blowing cold air provides a quick but temporary solution, while blowing hot air can fundamentally solve the fogging issue. 3. Use anti-fog spray: The principle of anti-fog spray is simple—spraying a layer on the windshield forms a protective film that prevents water vapor condensation. Below are additional details: Reasons for fogging when turning on the air conditioning: Due to the temperature difference between the inside and outside of the car, where the outside temperature is low and the inside temperature is high, the windshield, which separates the inside from the outside, also remains cold. The water vapor inside the car condenses into droplets upon contact with the cold windshield, forming a layer of fog that significantly impairs visibility. On rainy or foggy days, when the air humidity is high, the humidity inside the car also increases, leading to more water vapor and easier condensation into fog.