
The symbol for the front windshield defogger switch is a fan shape with three upward wavy lines inside. The symbol for the rear windshield defogger switch is a rectangle with three upward wavy lines inside. Correct usage of the car defogger switch: When there is fog inside the car, press the corresponding defogger switch, and the indicator light will turn on. After working for a period of time, the fog will disappear. If the defogger exceeds the preset time, it will automatically turn off. If the driver wants to manually turn off the defogger during operation, simply press the defogger switch again. Precautions for using the defogger switch: When using the front windshield defogging function, the vehicle must be started. The rear windshield defogger does not require the vehicle to be started; it only needs to be powered on to function normally. In some car models, when the rear windshield defogger is activated, the side mirrors will also be heated. Using the car defogger in conjunction with the vehicle's air conditioning system can achieve faster defogging.

I've been driving various cars for over a decade, and the defogger switch is marked with that fan-blade or wavy airflow icon pointing toward the windshield. The design is simple and intuitive, indicating direct airflow to clear fog from the glass. The principle works by using the AC's cold air to rapidly lower the glass temperature, reducing moisture condensation. It's incredibly convenient in practice—especially on rainy days or winter mornings when starting the car. The moment fog appears, I press it, and the fan activates to direct airflow at the windshield. Developing this habit is crucial for improving visibility and preventing accidents. I recommend car owners regularly check if the function works properly and never overlook AC system maintenance during routine servicing.

At the dealership, I've seen many customers struggle with defogging issues. The button symbol is usually a curved pattern simulating airflow directed towards the windshield, with basic models typically using a fan-shaped or wavy arrow design. When activated, the fan redirects air to the glass, working in tandem with the AC system for efficient dehumidification. Remember, the icon is usually located on the climate control panel - if it malfunctions, check the fuse or refrigerant levels. Personally, I always prioritize using this function while driving because it's simple, reliable, and ensures clear visibility when it matters most. Maintenance tip: test it once before each seasonal change.

When I first started learning to drive, I was often confused by foggy windows. A friend pointed out that the defogger button has an icon of airflow directed towards the glass, like small wavy lines pointing at the windshield. Pressing it activates the fan to blow air onto the glass, gradually clearing the fog—it works like a charm. The principle is that the cold air dries the glass quickly, so I always use it first when dealing with foggy conditions. It's simple and user-friendly, perfect for beginners. The icon design avoids complexity and is prominently placed in the AC control area. The rear defogger, however, has parallel wavy lines. Using it always boosts my confidence and makes driving safer.

Clear visibility is essential for safe driving, and the iconic defroster switch with its airflow-directed windshield symbol is a lifesaver. Whenever fog appears, I immediately turn it on to activate the air conditioning system for rapid dehumidification. The design uses symbolic and easily recognizable patterns like waves or fans. It helps prevent accidents in daily driving—for example, pressing it for a few seconds quickly clears fog on rainy highways. I emphasize forming the habit of preheating the car before driving, which improves efficiency and ensures unobstructed vision. Regular maintenance is crucial to avoid failure; though small, this feature is indispensable.


