Which Button is for Defogging?
2 Answers
There are two defogging buttons in a car. One is for the front windshield defogging, marked with a fan-shaped symbol containing three upward wavy lines. The other is for the rear windshield defogging, marked with a rectangular symbol containing three upward wavy lines. Here are the related details: 1. Defogging: The principle of fog formation on car windows is due to the temperature difference between the 'cold outside and warm inside.' The temperature inside the car is higher than outside, leading to fog formation. Turning on the A/C switch activates the cooling state, which has the advantage of quickly removing fog but is not suitable for winter. Another method is using the heating system for defogging. This method is also effective, but it takes a few minutes to work. 2. Benefits: The car defogging button can reduce moisture, fog, and frost on the front and rear windshields and the exterior rearview mirrors, improving the driver's visibility and making driving safer.
I have so much experience with this issue, having driven for over a decade and using it every humid season. The front windshield defogger button is that fan-shaped icon with wavy arrows, usually located above the center console’s AC panel. The rear windshield defogger is a rectangular icon, often shared with the rearview mirror heating function. On rainy foggy days, I just press the fan-shaped button, and the AC automatically switches to external circulation with high airflow directed at the glass. But be careful not to turn on the heater immediately after starting the car—the temperature difference can actually worsen fogging. Wait for the engine coolant to warm up first for optimal defogging. Ventilating the car by opening windows before parking helps reduce fogging, and regularly cleaning the interior side of the windshield is also crucial. If you neglect these details, even pressing the right button won’t give you the best results.
