How to Defog a Car in Winter?
2 Answers
Methods to defog a car in winter: 1. Adjust the air vents to direct airflow toward the windshield and turn on the heater; 2. Apply a specialized defogging spray to the windshield and wipe it clean with a dry towel; 3. Open the windows to allow air circulation, equalizing the interior temperature with the outside temperature; 4. Use a defogging cloth to wipe the windows. Reasons for car window fogging: 1. When humidity is high, the window temperature is lower than the dew point temperature; 2. When the temperature is too low, the window surface becomes saturated with moisture, and the vapor pressure is lower than that of the surrounding environment; 3. There is a temperature difference between the two sides of the window; 4. A significant temperature difference exists between the car's interior and exterior; 5. The car floor mats are damp.
As a seasoned driver who has weathered many winters, I believe defogging in winter requires both prevention and quick action. If I notice water droplets or fog on the windows before getting in the car, I first wipe them down with a dry cloth to reduce the risk of fogging. After starting the vehicle, I immediately turn on the engine, set the fan to maximum speed, direct the airflow toward the windshield, and activate the heater to warm the air and evaporate moisture. Don't forget to turn on the air conditioning's compressor cooling function—it quickly removes humidity, lowering the interior moisture level for faster results. If fog has already formed, I slightly crack open a window to balance the temperature and humidity difference between inside and outside, which usually clears it up in minutes. For prevention, I regularly clean the interior windows with a microfiber cloth to remove grease and dust, as oil residue makes water droplets cling more easily. Applying an anti-fog spray can also create a protective layer on the surface to minimize fogging. The key is speed—fog severely impairs visibility, making it dangerous, so avoid distracted driving while handling it.
