Why Do Car Lights Fog Up?

[LaLeilani]

Car lights fog up mainly due to high air humidity, causing water vapor in the air to condense inside the headlights. This fogging is a normal phenomenon. Here are the methods to deal with foggy car lights: 1. Defogging method for fogging caused by physical phenomena: If the headlight "fogging" is due to physical phenomena, car owners need not worry. Simply turn on the headlights normally every day, and the fog should dissipate in about a week. 2. Defogging method for fogging caused by water ingress: First, keep the engine idling, then open the engine hood, unscrew the dust cover or dust cap, and keep the headlights on for about 30 minutes. After that, use an air gun to increase the airflow speed inside the lamp cover until the moisture and fog are completely removed. 3. Defogging method in dry climates: Turn on the headlights to dry the fog inside, then turn off the engine and the headlights. Pour water over areas where leaks might occur, such as the waterproof cover or cap. If fog appears inside the headlights after a few minutes, it indicates a poor seal in that area. Otherwise, the issue lies in the bonding between the lamp cover and the lamp base.