Should You Use Recirculation or Fresh Air Mode to Prevent Fogging on Rainy Days?
2 Answers
Should You Use Recirculation or Fresh Air Mode to Prevent Fogging on Rainy Days? There are three scenarios to consider: 1. Windshield: On rainy days, if the front windshield fogs up, use the fresh air mode. Turn on the cold air. 2. Complete Defogging: If you want to completely eliminate fog inside the car, you should turn on the air conditioning and select hot air to blow on the windshield. Similarly, start with the fresh air mode, choose hot air and the front windshield vent, wait for about 5 minutes, then switch to recirculation mode or turn it off directly. Of course, vehicles with air conditioning heating functions will defog faster and more effectively. 3. Breath-Induced Fogging: In recirculation mode, both side windows may fog up, obstructing the driver's view. Therefore, it's best to use the fresh air mode and adjust the airflow direction toward the windshield. Using fresh air mode can expel the moisture exhaled by passengers from the car, while the outside cold air is less likely to condense.
I always get a headache when it rains because of the foggy windows. I used to think that keeping the recirculation mode on would keep me warm and prevent fogging, but the windshield just turned into frosted glass, completely white. Later, a mechanic told me that on rainy days, I should turn on the fresh air mode to draw in dry air from outside and replace the humid air inside. Once the moisture from breathing is carried away, the glass won’t fog up as easily. Now, the first thing I do when I get in the car is press the fresh air button and pair it with the AC blowing on the windshield—the effect is noticeably better. Never use recirculation mode; that just traps all the moisture inside the car, making the fogging worse. If it’s cold and rainy, adding a bit of warm air helps with dehumidification, making it safer and more convenient.
