What to Do When the Windshield Fogs Up with the AC On?
3 Answers
Here are solutions to deal with windshield fogging when the AC is on: 1. Apply Anti-Fog Spray: Spray a small amount of anti-fog solution on the inner surface of the car windows to remove dirt and stains. While cleaning the glass, it forms a thin transparent protective film that effectively prevents moisture from condensing into fog, especially useful in cold winters. 2. Air Conditioning Cooling Method: Use the AC's cooling and dehumidifying function to reduce air humidity and eliminate fog. In summer, especially when many people enter the car without turning on the AC promptly, the exhaled humid air can quickly cause the windshield to fog up. 3. Air Conditioning Heating Method: Use the heating function to raise the temperature and remove fog. This can quickly prevent heavy fogging on the windshield, but the rear and side windows warm up more slowly, requiring more time to completely clear all fog.
Oh, I've encountered this issue while driving - it's really annoying when the windows fog up with the AC on, mainly due to the temperature difference between the warm interior and cold exterior causing moisture condensation. My usual approach is to first press the defog button in the car, direct the vents to blast air at the windows, and turn on the external circulation mode to reduce humidity. I set the temperature around 22°C, avoiding extremes. Normally, I'm careful not to leave wet clothes in the car or bring wet umbrellas inside on rainy days to maintain dry air. Regularly cleaning the windshield of grease with tissues or specialized cleaners significantly reduces fogging chances. Don't neglect the AC filter either - a dirty one impairs dehumidification, so I recommend checking or replacing it every six months. Safety first: if fog obstructs visibility, don't force it; pull over immediately to address it and wait for the fog to clear before continuing. These tips have served me well for years and are quite effective.
As a newbie, I also experienced fogging when turning on the AC right after buying my car, which was quite alarming. Later, I learned a thing or two: it's mostly caused by high humidity or dirty glass leading to condensation. The solution is simple—just press the defrost mode button and increase the fan speed to blow on the windshield. Avoid using recirculation mode; switch to fresh air intake to reduce moisture. Set the temperature to medium, as higher settings can worsen fogging. For daily prevention, I wipe the inside of the windows clean after washing the car to avoid residual water droplets. On humid days, turning on the AC a few minutes before driving helps a lot. If it rains or gets cold, keeping a towel handy to wipe the windows works too. These basic steps are easy to remember. New drivers shouldn’t panic—just spend two minutes adjusting the AC, and safe driving is what matters most.
