What to Do When the Windshield Fogs Up on Rainy Days?
3 Answers
When the windshield fogs up on rainy days, the correct approach is to use the air conditioning to defog. Here are some solutions for dealing with a foggy windshield on rainy days: 1. Open the side windows slightly: This allows air to circulate between the inside and outside of the car, reducing the temperature difference and eliminating the fog. 2. Turn on the front window defogging mode: Set the fan speed to maximum. 3. Use a defogging spray: Spray it on the fogged windshield and wipe it dry with a cloth. The defogging spray forms a protective film on the glass surface, preventing moisture condensation. 4. Turn on the AC switch: In winter, you can use the heating system to defog.
Windshield fogging up on rainy days is quite annoying, mainly caused by moisture condensation due to humidity and temperature differences inside and outside the car, which can blur vision and increase accident risks. My first instinct is usually to turn on the car's air conditioning, setting it to the defogging mode—blowing either cold or warm air toward the windshield works, though cold air clears fog faster. If the fogging is severe, I crack open a window for a few minutes to ventilate and improve airflow. For safety, I always test the defogging function before driving in the rain and have the air conditioning system checked annually to ensure clean filters. Never risk driving with heavy fog—pull over safely to address it. This habit has helped me avoid several dangerous situations, and I recommend everyone adopt regular maintenance practices.
Here are some practical tips to deal with foggy windshields. On rainy days with high humidity, condensation easily forms due to the temperature difference inside and outside. I immediately turn on the air conditioning defogging mode, setting the temperature to medium for the best effect. Usually, I keep a bottle of defogging spray handy—spray it on the inner side of the glass and wipe it evenly with a microfiber cloth to prevent fogging for several weeks. Another cost-saving method is to open the windows slightly to balance air humidity and avoid exhaling warm air while talking inside the car. If this issue occurs frequently, check whether the car’s seals have aged, allowing moisture to seep in, or if the air conditioning’s cooling efficiency has declined. Cleaning the filter yourself once a month is simple and effective for preventing potential issues.
