Be careful when driving at night.
Headlights are blurry and unsafe,
Water mist covering the lights is very dangerous.
Safety first is the most important thing.
Today, Lu Lu shares with you some auto repair knowledge: what to do if the headlights are filled with water or foggy.
[Causes of headlight fogging]
As usual, Lu Xiaofa first shares with everyone the causes of water mist in car headlights.
First of all, we must first know that the overall structure of the car light is not completely vacuum. It is generally designed to allow air flow exchange between the car light and the outside world. Firstly, air exchange can make the temperature of the car light less high, and secondly, it can maintain the air pressure inside the car light. Stablize.
Secondly, when the car light shines, the interior of the car light will heat up rapidly, and the temperature difference with the outside world will form small water droplets, which will be heated and vaporized. After the car light is extinguished, the internal temperature of the car light will drop rapidly. After the temperature difference is generated, the water vapor will form on the glass. Condensation on the lampshade forms water mist. We call this situation the respiration of the car lamp.
Under normal circumstances, it is normal for car lights to produce water mist. You can observe and test the operation of the car lights at this time. If the water mist persists for a long time, there may be some problems with the car lights themselves.
【Rubber breather tube】
In addition, another small part that causes water mist in the car lights is the rubber breather tube on the back cover of the headlights.
Usually, the main function of this breather pipe is to dissipate the heat inside the car lamp outwards, so that the overall temperature inside the car lamp can be relatively stable. Of course, the rubber tube connects the hot and cold airflow inside and outside, causing moisture in the humid air to accumulate on the inner wall of the lamp housing, thus producing water mist. Especially in winter when the temperature difference is large, more water vapor flows down the lamp housing to form water accumulation. Generally speaking, this is a normal situation, and you don't need to worry too much. Follow the above method and turn on the car lights for about 13 minutes, and the water mist will quickly evaporate or flow out of the rubber tube.
[External causes]
There are other factors that cause water mist to accumulate in the car lights, such as after the vehicle passes through water, the car is washed, and the front engine compartment is cleaned, there will always be some water that cannot be completely removed. These situations may be the cause of the moisture in the car lights.
The water mist on the car light housing will cause strong interference to the light transmittance, and sometimes it will prevent the car light from being concentrated and scattered. Scattered light cannot be focused and has insufficient penetrating power. Driving at night, especially for those who drive at night, poses a high safety risk, so you must be cautious and pay attention to the problem of car lights.
So, how should we deal with the more serious problem of damage to the car lights themselves?
1. Treatment of structural damage to car lights
If it is found that there is too much water accumulation in the car lights, which seriously exceeds the water controllable range warning line, and the water mist condition has a serious impact on the light of the car lights, then it may be a car light sealing problem, which manifests as damage to the lamp housing or back cover, or The sealing between the lamp housing and the back cover is weakened.
The solution is to remove the headlight assembly and carefully check whether the lamp housing, back cover and ventilation rubber tube are obviously damaged. If there is no problem, it is best to separate the lamp housing from the assembly and keep them dry. Then reconfirm the sealing condition.
In addition, I hope everyone will be more careful about the vehicle after rain or cleaning. You can use a high-pressure air gun to clean the places where water often accumulates inside the engine compartment, so that the accumulated water inside can be cleaned faster. Lu Xiaofa is here to remind everyone that it is best not to use a high-pressure water gun to spray the hood when washing the car. This may cause a large amount of moisture to accumulate inside and make it very difficult to clean later.
2. Handling of normal situations
Under normal circumstances such as when the vehicle is traveling on water or in rainy weather, the water mist generated inside the car lights is still within a controllable range, that is, it does not affect the overall lighting function of the car lights. At this time, turning on the car lights for about 13 minutes can make the lights turn on. The heat emitted evaporates the water mist, allowing the car lights to return to normal working condition.
Finally, Lulufa’s professional repairmen remind you that disassembly and assembly of parts of your car requires professional techniques. Disassembling and assembling alone will run the risk of damage. When the car lights encounter this situation, it is recommended to go to an auto repair shop for disassembly and assembly.
