What is the Defog Button in a Car?
2 Answers
There are two defog buttons in a car: one is a fan-shaped front windshield defogging symbol, and the other is a rectangular rear windshield defogging symbol. In addition to pressing these two buttons, you also need to press the car's AC button when defogging. Warm Air Defogging: In winter, due to the cold weather, the heating function of the air conditioner is often turned on when riding in the car. The temperature inside the car will be much higher than the outside temperature, causing a lot of fog to form on the windshield. At this time, simply turn the heating to the maximum and activate the defogging function to evaporate the fog on the windshield with hot air. Cold Air Defogging: On rainy days, foggy days, or humid days, the humidity inside the car is very high, and the amount of active water vapor inside the car is also extremely high. In these situations, fog tends to form on the windshield. At this time, turn on the air conditioning cooling and the defogging button to make the temperature inside and outside the windshield similar, which will help remove the fog.
When I first learned to drive, dealing with foggy windows felt like the blind men trying to identify an elephant—utterly chaotic. A friend told me about the defogger button, the one on the center console with a fan icon pointing at the windshield. Press it, and the AC switches to maximum speed blowing at the front glass, clearing the fog in seconds. It’s especially handy in winter with big temperature swings. I’ve made it a habit to turn on the heater to warm up the car first, then hit the button preemptively when I sense fog forming. Over time, I picked up a neat trick: regularly cleaning the dust buildup on the inside of the windows reduces fogging and saves button presses. Safe driving hinges on these small details—clear visibility means peace of mind on the road. On rainy days or cold starts, don’t hesitate; the button’s placement is designed to be obvious, so no fumbling around.
