Where is the rearview mirror heating switch on the Audi A4?

[Declan]

The rearview mirror heating switch on the Audi A4 is located on the driver's side door panel, featuring a fan-shaped upward arrow. Simply press this button to activate the rearview mirror heating. This function is particularly useful during rainy or snowy weather, as the heater behind the mirror quickly warms the surface, gradually removing rain or fog, eliminating the need for frequent manual wiping and reducing driving hazards. Methods to use the rearview mirror heating function: The rearview mirror heating function typically has two activation methods. One is combined with the electric mirror adjustment button—just rotate the knob to activate it. The other is located on the air conditioning control panel—press the heating button to turn it on. No manual angle adjustment is needed, as the driver's side has adjustment buttons. Principle of the rearview mirror heating function: After rotating the knob, the electric heater behind the rearview mirror glass rapidly heats up to a fixed temperature (usually between 35-60°C) within minutes. Heat is then emitted from both side mirrors. Meanwhile, as the temperature rises and evaporates, water droplets on the mirror surface shrink, and fog gradually dissipates, effectively defrosting the mirror. However, in heavy rain, its effectiveness may decrease. Precautions for using the rearview mirror heating function: The principle involves electric heating wires embedded in the mirror, which consume significant power. Ensure the car is running when using this function to avoid draining the battery, which could prevent the car from starting. Other methods to defog rearview mirrors include: Window ventilation: Open both side windows slightly to create air convection, reducing temperature differences and gradually eliminating fog. Using car air conditioning: Adjust the air conditioning to the appropriate setting to blow warm air for defogging.