Many maintenance friends, drivers and friends have encountered fog or water inside the car headlights, which greatly affects the use of the car headlights. 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? Under normal circumstances, many people don't know how to distinguish whether the headlights are filled with water or fogging. They often think that there is water in the headlights as soon as they see water droplets. Today the editor summarized three points, hoping to be helpful to car owners.
1. Structural principle of 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. A large amount of heat will be generated when the headlights are lit and even when the headlights are in use. The function of the breather pipe is to discharge this heat out of the headlights as much as possible to maintain the normal operating temperature of the headlights and ensure the use of the headlights. Stablize.
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.
2. How to deal with headlight fogging
In this case, you don't have to worry too much. After the car lights are turned on for a period of time, the mist will be discharged out of the lights through the vent pipe along with the hot air. This will basically not damage the headlights and electrical circuits.
In this case, friends should not act rashly. For example, never bake the headlights. Doing so can easily damage the headlights, because the outer surfaces of the headlights are made of plastic material, and the extra heat can easily bake the lampshades. Most of this damage is irreparable.
In addition, in addition to weather changes, human factors can also cause water to enter the car lights, such as vehicle wading, car washing, 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 more straightforward. Some car owners like to use a high-pressure water gun to wash the engine compartment and watch the mud and leaves being knocked back one by one by the high-pressure water gun in their hands. 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.
3. How to deal with water in the headlights
The above mentioned are relatively minor cases of water entering the lamp. However, if the water inside the headlight is enough to raise fish, then it is necessary to disassemble it, open the lampshade, and after drying, check whether there is any water on the surface of the headlight. If there is damage or possible leakage, 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 to require car owners to develop the habit of regularly checking their lights. For example, it is necessary to inspect the vehicle after it has been waded into water. Early detection and early remediation can eliminate faults in their bud in a timely manner.
