Is REAR the Rearview Mirror Heating Switch?
2 Answers
REAR is the defogging and heating switch for the rear window and rearview mirrors. Pressing it can remove fog from the rear windshield, and some REAR buttons can also heat the rearview mirrors. Nowadays, many car models omit the REAR label and simply use a square with an upward wavy line icon. Rearview mirror heating is particularly useful during rainy or snowy weather. When activated, the heater behind the mirror quickly warms the surface, gradually removing rainwater or fog from the mirror. This eliminates the need for drivers to frequently wipe the mirrors manually, reducing driving hazards. The causes of car window fogging: Due to the temperature difference between the inside and outside of the car, windows are prone to fogging. The window glass, in contact with the external environment, remains cooler, causing water vapor inside the car to condense on the glass and form fog. When the window temperature is below the dew point, given a certain air humidity, condensation easily forms on the window surface, leading to fogging on the front windshield. If there is a temperature difference between the two sides of the window, the side with the lower temperature will have a lower saturation vapor pressure compared to the surrounding environment. This causes water vapor to gather on the glass surface, forming tiny droplets that appear as fog. Defogging principle: Copper wires are embedded in the rear windshield. When there is moisture or fog on the rear windshield, an electric current heats these copper wires. The heated windshield then dissipates the fog. According to current automotive rear windshield defogging designs, the heating function automatically turns off after about 10 minutes to protect the heating wires. The car air conditioning system is designed to cool, heat, ventilate, and purify the air inside the cabin. The car air conditioning controller is a device that regulates the air conditioning system, offering functions like cooling, ventilation, and defrosting. All components are securely installed, with controls and operating mechanisms that are flexible and easy to use, ensuring safe and reliable performance.
I was also quite curious before whether 'rear' refers to the rearview mirror heating switch. On most cars, it actually controls the rear window defogger, not specifically designed for rearview mirror heating. However, many models integrate the rearview mirror heating function into the same button—pressing the 'rear' defogger also heats the mirrors, which is convenient for quickly removing moisture in rainy or foggy conditions to maintain clear visibility. If the mirrors aren't heating up, it might be due to a blown fuse or poor wiring contact—check the manual for specific settings. This feature is very practical for daily driving. Safety comes first, so don’t neglect it. Make it a habit to test it regularly to ensure the system works properly, reducing accident risks and enhancing the driving experience.
