What is the rearcooler switch in a car?
2 Answers
The rearcooler in a car is the rear window defogger switch. When this switch is pressed, the rear window defogger, the exterior rearview mirror defoggers, and the front wiper de-icing device will all activate simultaneously. The defoggers and de-icing device will automatically turn off after approximately 15 minutes. Below is more information about car defoggers: 1. Introduction: The car defogger is located on the center console. The car defogger switch controls the defogger, which is used to reduce moisture, fog, and frost on the front and rear windshields and exterior rearview mirrors to improve visibility. 2. The physical principle of cold air defogging in cars: After the liquid refrigerant absorbs heat from the cooled object in the evaporator, it vaporizes into low-temperature, low-pressure steam, which is then drawn into the compressor, compressed into high-temperature, high-pressure steam, and discharged into the condenser. 3. The physical principle of hot air defogging in cars: When gas containing mist flows through the defogger at a certain speed, due to the inertia of the gas, the droplets that aggregate from collisions with the wave plates are very large. The gravity caused by the droplets exceeds the combined force of the gas lift and the surface tension of the liquid, causing the droplets to separate from the surface of the wave plates.
When I first learned to drive, I wasn’t quite sure what this switch was for. After driving more, I found out it’s called the rear window defroster button, usually marked with a small square icon on the dashboard featuring horizontal stripes. Pressing it heats the rear window to melt frost and fog, ensuring clear visibility when reversing—especially useful in winter or rainy weather. Some older cars may only have a basic switch function, while newer models can integrate with the air conditioning system to intelligently adjust cabin temperature, enhancing driving safety. I still remember one heavy snow day when I almost hit the roadside because I didn’t use it. So, it’s important to regularly check for wiring wear during maintenance to prevent malfunctions—otherwise, driving can become quite unsafe.
