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Why do car headlights fog up?

Causes of fogging:

1. During the rainy season, heavy rain or winter, when the headlights go out and the temperature inside the lamp unit drops, water molecules in the air can easily enter the cavity of the lamp unit through the rubber vent pipe or vent hole. When the temperature inside the headlight cavity is unbalanced and the temperature difference between the inside and outside of the lampshade is too large, water molecules in the humid air will gather from high-temperature places to low-temperature places, increasing the humidity in these parts, and then condensation on the surface of the inner lampshade. , forming fog.

2. There is another situation such as vehicle wading, water mist generated after car washing, etc. Since the engine and exhaust system themselves are relatively large heat sources after the vehicle is waded in water, rainwater will form a large amount of water vapor when it is poured on them. If the breather pipe is closed, some water vapor will enter the headlight. Car washing is more straightforward. Some car owners like to use high-pressure water guns to flush the engine compartment. After flushing, the water in the engine compartment is not dealt with in time. After the engine compartment cover is closed, the water vapor cannot be quickly dispersed to the outside of the car, which is boring. Water vapor in the engine compartment may enter the headlight.

Extended information:


You don’t have to worry too much about foggy car lights caused by ambient temperature differences. After the car lights are turned on for a period of time, the fog will be discharged out of the lights through the breather pipe along with the hot air. This will basically not damage the headlights and electrical circuits. It should be noted that you must not bake the headlights. Doing so can easily damage the headlights. Because the exterior of the headlights are made of plastic, the extra heat can easily bake the lampshades, and most of this damage is irreparable. of.

Usually when fogging occurs, as long as the headlights are used normally, it will completely dissipate in about a week. If it is particularly severe, you can open the back cover of the waterproof cover of the headlights, turn on the headlights, and let the xenon lamp dry out the fog inside. , then cover it with the waterproof cover after cooling and it will be fine. If water has entered, it is generally difficult to repair, and the headlight assembly needs to be replaced to completely solve the problem.

Why do car headlights fog up? 1

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