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Should the Rearview Mirror Heating Be Used with Internal or External Air Circulation?

2 Answers

PeytonFitz

07/25/25 1:00pm

Rearview mirror heating does not require turning on the air conditioning. Air conditioning is only needed for defogging the interior glass. If using the air conditioning for defogging, turn on the internal circulation. Rearview Mirror Heating Function: The rearview mirror heating function refers to the ability of the rearview mirror to heat up via electric heating wires embedded behind the mirror when driving in rainy, snowy, or foggy weather, ensuring the mirror surface remains clear. Principle of Electrically Heated Rearview Mirrors: An electric heating element (heating film) is installed inside the mirror of both side rearview mirrors. In rainy or snowy weather, when the driver activates the rearview mirror heating function, the heating element rapidly heats up to a fixed temperature within a few minutes, typically between 35-60 degrees Celsius, thereby heating the mirror surface to remove fog and frost.

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LeLilliana

08/11/25 8:33pm

My previous driving experience was that the rearview mirror heating was completely unaffected by the air conditioning circulation mode; as soon as I pressed that heating button, the mirror surface would start warming up to defog, whether in internal or external circulation mode, I drove as usual. I remember one rainy day when the rearview mirror got fogged up, I was worried about not being able to see the road clearly, but after turning on the heating switch for a few minutes, it became clear. I had set the internal circulation to keep the car dry, and it didn’t interfere at all. When the car was designed, the rearview mirror circuit was an independent and simple system, not as complex as the air conditioning; so don’t overthink it, just press the heating button. If you find that the heating isn’t working, you might need to check the fuse or wiring connections—don’t drive carelessly.

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