What is the difference between the front windshield defroster and the rear windshield defroster?

[Declan]

Here are the differences between the front windshield defroster and the rear windshield defroster: 1. Different methods: The front windshield defroster requires opening the air duct and using blowing air to remove fog, while the rear windshield has embedded heating wires that activate when the switch is turned on, using heat to eliminate fog. 2. Causes of formation: Windshield fogging usually occurs due to a significant temperature difference between the inside and outside of the vehicle. When the outside temperature is lower than the inside temperature, the warm air inside the car condenses on the inner surface of the windshield, forming fog. Conversely, when the inside temperature is lower than the outside temperature, water vapor in the atmosphere condenses on the outer surface of the windshield, forming fog. 3. Different functions: The rear window defroster is designed to address fogging or frost that appears on the rear window during winter or when there is a large temperature difference between the inside and outside of the vehicle, which can severely impair the driver's ability to judge vehicles behind. The principle of this function is that when activated, the embedded heating wires (similar to electric heating elements) on the window heat up, reducing the temperature difference between the inside and outside, causing the fog or frost to reach its melting point, thereby allowing the driver to clearly see the direction of vehicles behind.