What to Do When Car Side Windows Fog Up and Obstruct Rearview Mirror Visibility?
4 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.
I often encounter this issue, and here's a simple solution: start the car, turn on the AC to cold air, set it to external circulation, and direct the airflow to the fogged area. The fog will clear up in a few minutes. In winter, you can use warm air to defog, though it's slightly slower. Alternatively, open the windows to let fresh air in and allow the moisture to escape naturally. Keep a cloth in the car to wipe the windows as needed. For prevention, I've developed good habits: wipe the windows dry before getting in the car, and apply a commercial anti-fog spray for long-lasting effect. Avoid placing drinks or wet umbrellas inside the car to reduce humidity. Safety first—don't rush to drive when the windows are fogged up; make sure to clear them properly before setting off.
This car owner focuses on prevention to avoid fogging. When getting in the car, use a dry cloth to wipe the windows to remove dust. The air conditioning is always set to dehumidification mode to keep the interior dry. Avoid placing wet raincoats or bags on the seats to reduce moisture sources. Check the door seals to ensure there are no cracks allowing moisture to seep in. Occasionally treating the window surfaces with soapy water can prevent fogging for a week. These small measures reduce problems and ensure a worry-free drive.
