How to Deal with Foggy Car Windows in Summer?
3 Answers
Solutions for foggy car windows in summer include: 1. Using air conditioning to defog by turning on the AC and directing cold air towards the front windshield, utilizing the dehumidification function to remove fog; 2. Applying detergent-based anti-fog solutions; 3. Using anti-fog spray—spray it on the fogged windshield and wipe dry with a cloth for immediate clarity; 4. Installing rain visors to redirect airflow, reducing wind resistance and directing air towards the side mirrors to speed up evaporation and clear front windshield fog; 5. Utilizing the external air circulation system for defogging; 6. Activating the rear window heating to remove fog; 7. Slightly opening the window to allow air convection and reduce temperature differences.
I dread driving in summer rain with fogged-up windows the most! Last month during a heavy downpour, my windshield suddenly turned completely white. Immediately do three things: turn on the AC for cooling, adjust the air vents to blow on the windshield, and switch to external air circulation. The cold air can quickly remove moisture from the inside of the glass. If the fog isn't too heavy, cracking the windows slightly for ventilation also helps. Avoid using internal circulation—it only increases humidity. Remember not to set the temperature too low; around 23 degrees is most effective for dehumidifying. Shivering from the cold can actually make it harder to see the road. If your car has a heated rearview mirror function, remember to turn it on, and press the rear window defogger button as well. Once you get home, wipe the inside of the glass with a dry cloth to remove any oily film, which will slow down fogging next time.
Fogging up with AC on in summer is quite common, and I've figured out a fuel-saving trick. Don't rush to blast cold air immediately after getting in the car—first roll down all four windows for 1 minute of ventilation. Wait until the interior and exterior temperatures are similar before closing windows and turning on AC. When adjusting temperature, monitor the humidity gauge—if it exceeds 70%, you must press the AC button. For foggy windshields, direct cold air onto the glass; it works three times faster than using hot air. During light rain, try slightly opening diagonal windows—the airflow can carry moisture out. Always keep defogging wipes in the car; a quick wipe at traffic lights clears visibility instantly. When parking overnight, leave windows slightly cracked to prevent condensation by morning!
