Where is the rearview mirror heating button on the 2021 Buick Excelle?
2 Answers
The heating function for the rearview mirrors on the 2021 Buick Excelle is located on the vehicle's air conditioning control panel. It is a rectangular button featuring three curved lines with arrows from bottom to top. When the vehicle is powered on or started, simply press this button to activate the rearview mirror heating, which simultaneously turns on the rear windshield heating function. The rearview mirror heating is particularly useful in rainy or snowy weather. When activated, the heater behind the mirror quickly warms the mirror surface, gradually removing rainwater or fog, eliminating the need for the driver to manually wipe the mirrors frequently and thus reducing driving hazards. Principle of the rearview mirror heating function: After rotating the button, the electric heater behind the rearview mirror glass rapidly heats up to a fixed temperature within a few minutes, typically between 35-60 degrees Celsius. The heat is then distributed across the left and right rearview mirrors. As the temperature rises and evaporation occurs, water droplets on the mirror surface become smaller, and fog gradually dissipates, effectively defrosting and demisting the mirror. However, in heavy rain, the effect may diminish and become less noticeable. Precautions for using the rearview mirror heating function: The principle of rearview mirror heating involves electric heating wires embedded in the mirrors, which consume a significant amount of power. When using this function, ensure the vehicle is running. Avoid activating the rearview mirror heating while the car is stationary to prevent draining the battery, which could leave insufficient power to start the car. Additional methods for defogging rearview mirrors include: Opening windows for air convection: Slightly open both side windows to allow air flow between the inside and outside of the car, reducing the temperature difference and gradually eliminating fog. Adjusting the car's air conditioning to the appropriate setting can also help by blowing warm air to remove fog.
I've been driving this car for a long time, and the rearview mirror heating is really practical, especially in humid weather. On the 2021 Buick Excelle, it's not a separate button but combined with the defogging function. You need to look at the center console, where there's a small button on the air conditioning control panel marked with a rear window icon, shaped like a small rectangle with curves. Pressing it activates both the rearview mirror heating and rear window defogging. I often use this during winter rains—turn it on, wait a few minutes, and the fog and frost on the mirrors disappear, instantly clearing the view and making reversing easier. When I first drove it, I thought there would be a dedicated heating button, but later I checked the manual and learned this design saves space and protects the circuit. For daily use, I recommend turning it on right after starting the car instead of fumbling while driving, which avoids distractions and improves safety. Maintenance is simple too—as long as the button works, there’s no issue. It’s a thoughtful feature.
