How to Turn on the Car Air Conditioning on Rainy Days to Prevent Fogging?
3 Answers
When the humidity inside the car is high, turning on the A/C switch effectively defogs the windshield by dehumidifying the air from the vents, thus efficiently removing fog from the windshield. Activating the air recirculation mode helps quickly lower the temperature inside the car and prevents outside air and odors from entering the vehicle.
After driving for so many years, I've seen many drivers struggle with fogging issues on rainy days. The root cause is moisture inside the car condensing on cold glass. The solution is quick dehumidification using the air conditioning. Immediately after starting the car, press the defog button on the AC control panel (usually marked with a windshield icon). It automatically increases fan speed and directs cool air specifically for front window defogging. Set the temperature around 20°C, preferably using external air circulation rather than internal to prevent faster humidity buildup from breathing. Manually adjust the air vents to blow directly at the windshield, not other windows, with the fan at maximum speed. In heavy rain, you can slightly crack the windows for ventilation while keeping rain out. Develop good habits by regularly checking that the AC filter isn't clogged - it helps filter external moisture and maintains system efficiency. Remember these simple and safe operations - clear visibility prevents accidents.
In my early days of driving, I often struggled with foggy windows during rainy weather. Now I've figured out the tricks. The first thing I do after getting in the car is turn on the AC and press the defogger button - the fan immediately speeds up to blow air on the windshield. Keep the temperature moderate, neither too hot nor too cold. Using external air circulation is key as it draws in dry outside air to reduce humidity. Set the air vents to only blow on the front windshield. When it's raining heavily, close all windows and the fog will clear within minutes after activating the defogger. Don't forget regular AC maintenance - clean filters improve dehumidification efficiency and save fuel. These simple steps are easy to master, even for beginners.
