What Causes Fogging on Car Side Windows Obstructing Rearview Mirror Visibility?
2 Answers
This phenomenon generally occurs due to high humidity inside the vehicle coupled with low external temperatures, making it more frequent during spring, autumn, and winter seasons, while being rare in summer. Simply prepare a highly absorbent towel and gently wipe it off. Below are some methods to remove window fogging: 1. Open windows: Slightly opening windows creates air convection, using negative pressure to draw out fog. If equipped, open the sunroof and utilize its rear tilt function for rapid air exhaust. 2. Use the car's front defroster mode, which can quickly restore window clarity. 3. Apply anti-fog products: Many commercial anti-fog sprays work effectively when pre-applied on glass surfaces.
This is mainly caused by the large temperature difference between the inside and outside of the car. When it's cold outside and warm inside, the moisture in the car easily condenses on the glass, forming fog. Especially on rainy days or when the air is humid, closing the windows traps the moisture from breathing inside, causing the glass to fog up and block the rearview mirror's visibility. Another reason is improper use of the air conditioning system, such as setting the fan speed too low or not switching to defog mode, which prevents moisture from being effectively expelled. In some cars, a dirty air filter can also reduce dehumidification efficiency. To solve this, turn on the air conditioning and use cold or hot air to blow against the windshield while pressing the defog button to quickly clear the fog. Remember not to wipe the glass while driving; pull over to a safe spot first. Regularly cleaning the car's air conditioning system can also prevent such issues, as frequent fogging can seriously affect driving safety.
