How to Use Rearview Mirror Defogging and Heating?
2 Answers
The switch in the green circle is the front windshield defogging and defrosting button; the switch in the red circle is the rearview mirror heating button. When the rearview mirror heating button is pressed, the indicator light on the button will illuminate, and the heating element will quickly reach a set temperature within a few minutes. After the rearview mirror is heated, water droplets on the mirror surface will gradually evaporate and shrink due to the rising temperature, and fog will slowly disappear. Many vehicles now combine the rearview mirror heating button with the rear window defrosting and defogging function button, meaning pressing the rearview mirror heating button will also activate defogging simultaneously.
When I first bought the car, I couldn't tell the difference between these two functions either. Actually, the rearview mirror heating button is usually located near the air conditioning controls on the center console, with an icon showing two rectangles with wavy arrows. Just press it directly when it's raining or foggy in winter, and it will automatically heat up for 5-10 minutes to clear up. Some cars make it even easier by combining the rearview mirror heating and rear window defogger into one button—pressing it activates both simultaneously. Remember, turning on the air conditioning in summer can defog faster, but the heating function works best on water droplets. After parking, make sure to turn it off promptly, as leaving it on for too long may shorten the mirror's lifespan.
