How to Deal with Fogging on Both Sides of Car Windows on Rainy Days?
2 Answers
On rainy days, fogging on both sides of car windows can be addressed by opening windows for ventilation, turning on the air conditioning (A/C) for cooling, using heating to remove fog, or applying specialized defoggers. The primary reason for fogging on car windows during rainy days, especially in winter or cold seasons, is the higher temperature inside the car compared to the outside. The significant temperature difference causes moisture inside the car to condense into tiny water droplets, which instantly liquefy and form fog on the windshield. Opening Windows for Ventilation: If the rain is light and the rainfall is not heavy, you can slightly open both side windows to allow air circulation between the inside and outside of the car. This method works on the same principle as using the air conditioning to blow cold air, but the window opening should be adjusted based on the intensity of the rain. Turning on the Air Conditioning (A/C) for Cooling: Turn on the external air circulation, set the fan to maximum speed, direct the airflow toward the windshield, adjust the vents to the front windshield mode, turn on the A/C cooling switch, and then set the temperature to the lowest. Heating to Remove Fog: During summer rains, if the rainfall is heavy and the outside temperature is low, opening windows for ventilation may not be feasible. In such cases, you can use the heating function to remove fog. Some cars come with a one-touch heating defogging button—simply press it to clear the fog. If your car doesn't have this feature, turn on the car's air conditioning and switch to heating mode, directing the vents toward the windshield. Once the hot air dries the moisture on the windshield, the fog will disappear. Specialized Defoggers: You can purchase specialized defoggers that create a protective film on the glass surface, preventing the formation of fog. Spray the defogger evenly on the windshield and wipe it clean with a dry cloth. This will prevent fogging for a short period. However, defoggers have a limited effectiveness duration and need to be reapplied periodically.
Driving in rainy weather with fogged-up side windows can be quite annoying, mainly due to the high humidity inside the car and temperature differences, which can easily obstruct visibility. I usually start by turning on the fan at a medium speed, directing the air vents toward the windows. At the same time, I activate the air conditioning's dehumidification function to dry the air and quickly clear the fog. Switching from recirculation mode to fresh air mode helps introduce outside air and reduce moisture buildup. If the fogging is severe, I gently wipe the windows with a clean cloth I keep in the car, being careful not to get distracted while driving. As a preventive measure, I keep the inner surfaces of the windows clean, free of fingerprints and grease, and apply an anti-fog spray quarterly, which reduces fogging frequency on rainy days. It’s also important to regularly check the air conditioning’s dehumidification performance. Remember, roads are slippery in the rain, so slow down when windows fog up and always prioritize safety.
