How to Defog the Car Interior on Rainy Days?
2 Answers
The methods to defog the car interior on rainy days are: 1. After starting the engine, turn on the warm air conditioning and adjust it to a higher setting, directing it towards the windshield; 2. Evenly spray a defogging agent on the glass. The reasons for car window fogging are: 1. When humidity is high, the window temperature is lower than the dew point temperature; 2. When the temperature is too low, the surface moisture of the window becomes saturated, and the vapor pressure is lower than that of the surrounding environment; 3. There is a certain temperature difference between the two sides of the window; 4. A large temperature difference exists between the inside and outside of the car; 5. The car floor mats are damp. The impact of window fogging is: It obstructs the driver's view, making the road ahead appear blurry and affecting safe driving.
Driving in rainy weather with foggy windows is quite a common issue. After years of driving, I've summarized some effective solutions. First, turn on the air conditioning system and locate the defogger button—usually marked with a fan-shaped symbol—which automatically activates the defogging mode. Then, adjust the airflow direction toward the windshield to ensure cold air or external circulation quickly dries the moisture. If the fog is too heavy, I briefly crack open a window to balance humidity by allowing air exchange, preventing persistent fogging. Don’t forget to turn on the rear defogger and side mirror heating functions, especially during heavy rain, as safety comes first. I also regularly clean the inner side of the windows with a damp cloth to remove grease and dirt, since clean glass resists condensation. If the A/C underperforms, it might be due to a clogged filter or low refrigerant—schedule maintenance in advance to avoid emergencies. Adopting these habits can significantly improve driving comfort in rainy conditions.
