What to Do When Car Side Windows Fog Up and Obstruct Rearview Mirror Visibility?
2 Answers
After fogging occurs, the defogging function should be used. Windshield defogging utilizes the car's air conditioning system, while rear windshield defogging employs electric heating wires. When defogging the car windshield, it is recommended to turn on the external air circulation, as this can accelerate the defogging speed. The heating wires will automatically turn off after operating for a while. This is not a malfunction but a protective measure preset for the heating wires.
Having driven for many years, it's quite common for the side windows to fog up, making it hard to see the rearview mirrors, mainly due to the temperature difference between the inside and outside of the car causing moisture condensation. I first turn on the air conditioning to the defogging mode, set the fan to maximum, and direct it toward the side windows, which can quickly absorb moisture. At the same time, I open the windows slightly for ventilation to let the moisture disperse. If the effect is slow, I use a clean microfiber cloth to gently wipe the glass—avoid using hands as they leave fingerprints. Prevention is key: treat the windows with anti-fog spray to keep them clean, and avoid placing wet items in the car. Regularly check the dehumidification function of the air conditioning system, especially performing maintenance before the rainy season arrives. For safety, I slow down or pull over when fogging occurs, ensuring visibility is restored before continuing to drive.
