How to Deal with Foggy Windows in a Car?
4 Answers
To handle foggy windows in a car, you can follow these methods: 1. Open the windows to create air convection between the inside and outside of the car, which will reduce the temperature difference and make the fog disappear; 2. Turn on the car's defogging function, and select the appropriate cold or warm air from the air conditioner to use the air blown by the air conditioner to defog. The steps to turn on the defogging function are: 1. Open the driver's door; 2. Press the car's brake pedal to start the engine; 3. Press the car's one-touch start button; 4. All the dashboard lights will turn on, indicating that the engine has started; 5. Press the defogging button located on the center console.
I usually drive to and from work. When the windows fog up, the first thing I do is turn on the air conditioning defrost function, adjust the air vents to blow towards the windshield, and turn on the AC switch to cool the air and dry it out. Within a few minutes, the road becomes clear. Fogging mainly occurs when water vapor exhaled by passengers inside the car condenses on the cold glass. In winter, preheating the air conditioning before getting in the car in the morning can prevent this. If it's raining outside and the windows fog up, remember to turn on a bit of the external air circulation to help reduce humidity—don’t rely solely on internal circulation, which can trap moisture. I also keep an anti-fog spray in my car; one application lasts about a week, making it both convenient and safe. Make it a habit to check the temperature difference inside and outside the car. On hot days, open the windows to ventilate and reduce humidity, ensuring fog doesn’t obstruct your vision and endanger your driving.
I've been driving since my student days and often encounter foggy windows during rainy commutes. That time when I was giving a friend a ride, the windows were all misty. I quickly set the air conditioning to blast cold air at the windshield while slightly opening the windows to let out the moisture, and the view cleared up immediately. High temperatures and humidity in summer also easily cause fogging—don’t use warm air then; cold air is more effective for dehumidifying. I’ve installed a small dehumidifier in my car as an aid, occasionally using warm air at the feet to speed up circulation. Safety comes first—slow down and drive steadily when fogging occurs, and regularly replace the cabin air filter to keep the system efficient. These experiences have taught me: deal with it early for peace of mind, don’t wait until visibility is poor to slam on the brakes.
Having driven for over twenty years, every time the windows fog up in cold winter weather, I habitually turn on the air conditioning to the warm air setting and select the defrost mode as soon as I get in the car, allowing dry air to cover the surface and remove moisture. The reason is simple: large temperature differences combined with condensation from passengers' breathing can obstruct vision if not addressed promptly. I've developed a routine of checking the air conditioning settings upon entering the car. If the fog is heavy, I first wipe the inner surface dry with a cloth to assist in defogging and keep the vents clean.
