How to Use Car Air Conditioning Correctly on Rainy Days?

[VonGriffin]

By directing the airflow of the air conditioning to the front windshield, you can defog the front windshield, thereby reducing the temperature difference on both sides of the glass. You can prevent the rear windshield from fogging up by using the rear windshield heating function to evaporate the moisture.

[McCharlie]

Last rainy season, I almost had an accident while driving. There are actually tricks to using air conditioning in rainy weather. Fogging is the most annoying - I usually press the front defogger button as soon as I get in the car, which automatically turns on the AC for dehumidification. Don't set the temperature too low, around 22°C is just right, as a small temperature difference between inside and outside the glass prevents fogging. Using external air circulation helps with ventilation, but switch to internal circulation during heavy rain to prevent moisture from coming in. Remember to turn on the rearview mirror and rear window heating - water droplets on mirrors are more dangerous than fog in rainy conditions. Try to avoid using hazard lights; it's better to turn on both front and rear fog lights during heavy rain for better visibility. Oh, and leaving a small gap in the window can also help balance the temperature difference.