What to Do When There is Fog on the Car Windows?
3 Answers
Solutions for fog on car windows: 1. Use cold air by turning on the cold air conditioner and directing the vents to the front windshield, then turn on the external circulation for quick and effective defogging; 2. Use hot air by setting the air conditioner to hot air, still directing the vents to the front windshield, and turn off the internal circulation; 3. Use specialized defogging products by evenly spraying defogging agents on the surface of the car window glass before driving and wiping it clean with a dry towel. Fogging occurs because the temperature of the car window glass in contact with the outside is lower, creating a large temperature difference between the inside and outside of the car, causing water vapor inside the car to condense on the glass and form fog.
Dealing with foggy windows while driving can indeed be frustrating. From my experience, the first step is to determine whether it's internal condensation or external frost. For internal fogging, simply press the front defogger button, and the air conditioning system will automatically adjust the airflow direction. If the weather is cold, turn up the AC temperature and set the fan to maximum speed—hot air clears fog much faster than cold air. I always keep a chamois cloth in the car for emergencies; a few wipes can restore visibility. A handy trick is to switch the AC to external circulation mode—reducing the temperature difference between inside and outside minimizes fogging. If defogging remains slow over time, it might be worth checking if the AC filter needs replacement.
I've encountered fogging issues too many times, especially when driving my kids to school in winter. The most effective method is to turn the heater on and direct it at the windshield - the fog usually clears within 2-3 minutes. Remember not to rush off; wait until the glass is completely clear before driving. I also regularly use specialized anti-fog spray on the windows, applying it during car washes. Once the protective film forms, fogging becomes much less likely. Side mirror fogging is particularly dangerous as it severely impairs visibility when reversing - don't forget to activate the rear window defogger. On rainy days, it's crucial to turn on the air conditioning's dehumidification function in advance; when humidity drops, fogging naturally decreases.
