What Type of Air to Use for Defogging Car Windows on Rainy Summer Days?
3 Answers
When fogging occurs on car windows during rainy days, you can directly turn on the warm air and increase the airflow. The dry, warm air will evaporate the water molecules in the car's interior air, preventing fog from forming on the windows. Relevant information is as follows: 1. Air Conditioning Warm Air Method: This method removes fog by reducing the temperature difference. In winter, blowing warm air onto the windows quickly raises the temperature of the front glass, reducing the temperature difference between the inner and outer surfaces of the window, which helps prevent excessive fogging on the windshield. 2. Anti-Fog Spray Prevention Method: Spray a small amount of defogging agent onto the car window and wipe it clean to remove dirt and stains from the glass. While polishing the glass, a thin transparent protective film is formed, effectively preventing the condensation of moisture on the glass and the formation of fog, which is particularly suitable for cold winters.
Foggy car windows on rainy days are quite annoying. As an experienced driver with over a decade behind the wheel, I know that high summer humidity and temperature differences between inside and outside the car cause window fogging. The best solution is to turn on the air conditioning in cooling mode with dehumidification, directing the airflow toward the windshield. Once the AC is on, it quickly removes moisture, and the fog dissipates immediately. If your car has a defog button or automatic system, simply pressing it saves trouble. Additionally, using the external air circulation can help with ventilation, but make sure the AC is on for dehumidification—external circulation alone may not be effective. Remember to set the temperature lower and avoid using internal recirculation, as it traps moisture and worsens the problem. When parking, try to close the windows to prevent humidity buildup, and keep a dry cloth in the car for emergency wiping. This method is safe and efficient, preventing accidents from obscured vision—give it a try, it works!
On days like this, I simply turn on the AC and switch to defog mode, as cold air quickly cools and dehumidifies. The principle is straightforward: rainy weather brings cold, humid outside air, while exhaling inside the car combined with high temperatures causes moisture to condense on the windows. After starting the car, press the AC button and adjust the airflow direction to the front windshield—usually indicated by a fan-shaped icon. If the AC isn’t cooling, briefly switch to external circulation for a few seconds before reverting to internal circulation with AC. Younger folks might find it tedious, but it’s the scientific approach. When the car’s control system is advanced, a one-touch defog function can be a lifesaver. Don’t forget to check if the AC filter is clogged—regular maintenance ensures smoother defogging and clear driving visibility, preventing minor issues from escalating into accidents.
