What is the symbol for the defogger switch?
2 Answers
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.
