What Causes Fogging in Car Headlights?

1 Answers
LaQuinn
07/25/25 1:49pm
The reason for fogging in car headlights is that moisture in the air enters the headlight through the vent pipe and adheres to the lens. As the moisture accumulates, fogging naturally occurs. This phenomenon is mostly caused by significant temperature differences. Here are the solutions for fogging in car headlights: 1. Generally, fogging inside the headlight can be resolved by turning on the headlights to dry it out naturally. In most cases, leaving the lights on for half an hour will dry the moisture. 2. Alternatively, compressed air can be used to blow-dry the headlight. However, it is recommended to prioritize the method of turning on the headlights to dry them, as using compressed air can often lead to dust entering the headlight assembly. 3. If there is noticeable moisture inside the lens that does not dissipate after turning on the headlights, it may be due to a seal failure or damage to the headlight. It is advisable to check the installation of the bulb and the headlight cover. If necessary, disassemble the headlight to inspect the seals and any damage from the outside in.
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