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What is the Principle of Rearview Mirror Defogging and Heating?

2 Answers

MacJasper

09/01/25 5:44am

Rearview mirror defogging and heating involve installing an electric heating element (electric heating film) inside the mirrors on both sides. During rainy or snowy weather, when the driver activates the rearview mirror heating function, the heating element quickly warms up to a set temperature, typically between 35-60 degrees Celsius, within a few minutes. This heats the mirror surface, effectively removing fog and frost. Benefits of rearview mirror heating: Rearview mirror heating is particularly useful in rainy or snowy conditions. When activated, the heater behind the mirror quickly warms the surface, gradually clearing away rain or fog. This eliminates the need for the driver to frequently wipe the mirrors manually, thereby reducing driving hazards. Precautions: Use rearview mirror heating sparingly and avoid exceeding 30 minutes per session, as prolonged use can affect the mirror's lifespan, clarity, and brightness.

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DeJoseph

09/13/25 8:24am

I find the principle behind rearview mirror defogging and heating really practical. The mirror heating function works by embedding fine resistance wires or heating films inside the mirror. When you press the switch, current flows from the car battery, generating heat to warm the mirror surface. This evaporates water droplets or melts frost, just like using a hairdryer to defog windows at home in winter. But it's safer and more convenient thanks to its sealed waterproof and dustproof design. Defogging is the direct result of this process - heat quickly transfers to the mirror surface, dissipating moisture. I recommend turning on the heating button immediately after starting the car on rainy days or cold mornings. Wait a few minutes until the mirror clears up, instantly improving driving visibility and preventing accidents. Also, be careful not to keep the heating on for too long, as it consumes significant power and may affect battery life. My experience is to turn it off once the mirror is clear to save energy.

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