How to Deal with Fog Inside the Car?
2 Answers
Solutions for fog inside the car include: 1. Keep a damp towel in the car and wipe away the fog when it appears; 2. If fog is caused by a significant temperature difference between the inside and outside of the car, open the windows to equalize the temperatures; 3. When the windshield fogs up, switch the air circulation system to external circulation; 4. Turn on the automatic climate control; 5. Spray an anti-fog agent on the windshield to form a protective film; 6. Turn on the air conditioner's cold air. Reasons for fog inside the car are: 1. Under certain humidity conditions, when the window temperature is below the dew point, condensation forms on the window surface; 2. A temperature difference on either side of the window causes the saturated vapor pressure on the cooler side to be lower than the surrounding environment's vapor pressure; 3. Moisture gathers on the glass surface, forming tiny water droplets that create fog.
When the weather turns cold, fog forms on the car's windshield, and I have to deal with it quickly to avoid affecting my driving visibility. I usually press the defog button on the AC as soon as I get in the car, switch to the external circulation mode, and direct the warm air toward the windows. The fog clears up in a few minutes. This happens because the humidity inside the car is too high, and the temperature difference is too large, so prevention is also important: don’t forget to open the windows for ventilation when parking, and place an absorbent mat on the back seat to absorb moisture. On rainy days, be extra careful not to leave wet umbrellas in the car, as this can prevent repeated fogging. If you're in a hurry, gently wipe the glass with a dry cloth, but don’t press too hard to avoid scratching it. Remember, safety comes first—never speed up when the windshield is foggy. Wait until the fog clears before driving.
