In terms of the overall structure of the headlight, whether it is an ordinary halogen headlight, a xenon headlight, or a headlight with an LED light group, there is a ventilating rubber tube on the back cover position, which can be used at the moment when the headlight is lit. The headlights will generate a lot of heat when in use. The function of the vent pipe is to discharge the heat out of the headlights as much as possible to maintain the normal working temperature of the headlights and ensure the stable use of the headlights.
The moisture in the air will enter the headlight through the air pipe and attach to the lampshade. As the water vapor accumulates, the water droplets will flow down the lampshade. This situation is mostly caused by large temperature differences, and this phenomenon is most likely to occur in winter and rainy seasons. After the lights are turned on for a period of time, the fog will be discharged out of the lights with the hot air through the snorkel, which will basically not damage the headlights and electrical circuits.
In this case, drivers and friends should not act rashly. For example, they must not bake the headlights, which will easily damage the headlights. Because the exterior of the headlights is made of plastic, the extra heat can easily bake the lampshade, and most of this damage is irreparable.
In addition to changes in the weather, human factors can also make the lights turn into "tear eyes", such as vehicle wading, car washing, etc. When the vehicle is wading in water, since the engine and the exhaust system themselves are relatively large heat sources, a large amount of water vapor will be formed when the rain falls on it, and some of the water vapor will enter the headlights along the ventilation pipe.
And car washing is more straightforward, and some car owners like to use a high-pressure water gun to wash the engine compartment. After flushing, the accumulated water in the engine compartment is not dealt with in time. After closing the engine compartment cover, the water vapor cannot be quickly released to the outside of the car, and the water vapor stuffed in the engine compartment may enter the interior of the headlights.
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