carMany driver friends have encountered the situation of fog inside the headlights. At this time, the headlights are like big watery eyes, which makes people feel compassionate. What the hell is going on, how can I be wronged like this. Is it because the headlights are not properly sealed, causing water to enter the headlights, or is the lampshade damaged and water vapor seeping into the headlights?
As far as the overall structure of the headlight is concerned, whether it is an ordinary halogen headlight, a xenon headlight, or a headlight with an LED lamp group, there is a venting rubber tube on the back cover. At the moment when the headlights are lit or even when the headlights are in use, a lot of heat will be generated. The function of the air duct is to exhaust this heat as much as possible outside the headlights to maintain the normal working temperature of the headlights and ensure the use of the headlights. Stablize.
It is this vent pipe through which moisture in the air enters the headlight and attaches to the lampshade. As the water vapor gathers, water drops 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. In this situation, drivers do not need to worry too much. After the lights are turned on for a period of time, the fog will be discharged out of the lights through the vent along with the heat, which will basically not damage the headlights and electrical circuits. In this situation, drivers and friends should not act rashly. For example, you must not bake the headlights. Doing so can easily damage the headlights. Because the exterior of the headlights is made of plastic material, the extra heat can easily burn the lampshade. Most of this damage is irreparable.
In addition to changes in the weather, human factors can also make car lights "tear eyes", such as car wading and car washing. When the vehicle is wading, because the engine and exhaust system itself are relatively large heat sources, rainwater will form a large amount of water vapor on it. Along the vent pipe, part of the water vapor will enter the headlights.
Car washing is even more straightforward. Some car owners like to flush the engine compartment with a high-pressure water gun. Watching the silt and leaves being repelled by the high-pressure water gun one by one, there is an indescribable sense of pleasure in their hearts. After washing, the accumulated water in the engine compartment was not treated in time. After the engine compartment cover was closed, the water vapor could not be quickly dissipated to the outside of the car, and the water vapor in the engine compartment might enter the headlights.
For the cleaning work in the engine compartment, we should more use cotton or cloth to wipe, or use high-pressure air blowing, as far as possible to avoid the engine part "damp".
All the above mentioned are relatively minor water ingress in the lamp, but if the water inside the headlight of your car is enough to raise fish, you must disassemble the lamp, open the lampshade, and dry it before checking the lamp. Whether there is any damage or possible leakage on the surface of the lamp, if no abnormality is found, we generally recommend replacing the sealing strip and vent pipe of the headlight rear cover.
In winter and rainy seasons, it is best for car owners to develop the habit of checking their lights regularly. For example, the inspection after the vehicle is wading is very necessary. Early detection and early remedy, and timely elimination of faults in the embryonic stage, is the best choice for car maintenance. (Dahe Net)
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