Many drivers and friends have encountered fog inside the car headlights. At this time, the headlights are like big watery eyes, which makes people feel pity. What happened? How could I be so wronged? Is it because the headlights are not properly sealed, causing water to enter the interior of the headlights, or is the lampshade damaged and water vapor penetrating into the interior of 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 light set, there is a ventilation rubber tube on the back cover. The moment the headlight is turned on and even when the headlight is in use, heat will be generated. The function of the breather pipe is to discharge this heat out of the headlight as much as possible to maintain the normal operating temperature of the headlight and ensure the stable use of the headlight.
It is this breather pipe through which moisture in the air enters the headlight and adheres to the lampshade. As the water vapor gathers, water droplets flow down the lampshade. This situation is mostly caused by large temperature differences, and is most likely to occur in winter and rainy seasons. In this case, drivers don't have to worry too much. After the headlights are turned on for a period of time, the mist will be discharged out of the lights along with the hot air through the ventilation tube. This will basically not damage the headlights and electrical circuits. In this situation, drivers should not act rashly. For example, they must not bake the headlights. Doing so can easily damage the headlights, because the exterior of the headlights are made of plastic material, and the extra heat can easily bake the lampshades. This Most of this damage is irreparable.
In addition to weather changes, human factors can also cause car lights to turn into "tear eyes", such as vehicles wading in water, car washes, etc. When a vehicle is wading through water, since the engine and exhaust system themselves are relatively large heat sources, rainwater will form a large amount of water vapor on them. Some of the water vapor will enter the headlights along the breather pipe.
Car washing is even more straightforward. Some car owners like to use a high-pressure water gun to wash the engine compartment. Watching the mud and leaves being repelled one by one by the high-pressure water gun in their hands gives them an indescribable sense of pleasure. After flushing, the water vapor in the engine compartment is not dealt with in time. After the engine compartment cover is closed, the water vapor cannot be quickly dispersed outside the car, and the moisture trapped in the engine compartment may enter the headlights.
For cleaning work in the engine compartment, we should wipe it with cotton or cloth, or use high-pressure air blowing to avoid "moisture" in the engine part as much as possible.
The above mentioned are relatively minor cases of water entering the lamp. If the water inside your car's headlight is enough to support fish, then you need to disassemble it, open the lampshade, dry it, and check the headlight. Check whether there is any damage or possible leakage on the surface. If no abnormality is found, we generally recommend replacing the headlight back cover sealing strip and vent pipe.
In winter and rainy seasons, it is best for car owners to develop the habit of regularly checking their car lights. For example, it is necessary to inspect the vehicle after it has been waded into water. Early detection and early remediation, and timely elimination of faults in their bud, is the best choice for car maintenance.
Source: Chuan Automobile Information
