Recently, many car owners have left messages on the Car Quality Network forum saying that their car lights are fogging up inexplicably. They suspect that the car lights were not sealed tightly enough when the vehicle left the factory, causing such problems. In fact, fogging of car lights is a common problem. We don’t need to be too nervous about this kind of thing. Moreover, fogging of car lights does not necessarily mean that water has entered the lights, and it is not directly related to the sealing of the headlights. So what exactly causes fogging in car lights? Let’s briefly talk about it below.
1. What causes car lights to fog up?
In fact, the main reason for fogging of car lights is due to the recent continuous cooling of the weather, especially in the northern region. Compared with the same period last year, the cooling this year is very obvious. In this environment, turning on the car lights at night will cause the temperature of the car lights to rise. When the vehicle is turned off or the lights are turned off, the temperature difference between the inside and outside is too great, and water vapor will condense on the car lights, causing the car lights to fog up. This This phenomenon is similar to windshield fogging in winter.
I believe many users may have this question. Aren't the car lights sealed? Why is there water vapor running in? In fact, in theory, the car lights are sealed, but there is usually a small vent left in the car lights to maintain the balance of internal and external air pressure. In addition, in order to prevent suspended particles in the air from running into the car lights along with the airflow, air filtration and purification membranes are installed at the vents to prevent dust from running into the car lights.
Therefore, as for the fogging of car lights, as long as it fogs inside the lamp cavity, it is not a big problem. This is caused by the large temperature difference at night. We can turn on the headlights, and the fog will disappear after a while. It will affect the normal use of car lights.
2. What should I do if the car lights really get flooded?
There are also some car lights that are not just foggy, but may have problems with water ingress. In this case, there is usually a problem with the sealing of the headlights. Among them, poor sealing design of the lamp itself, improper sealing coordination between wiring harnesses, and damage to the vent holes will all cause water to enter the lamp. According to statistics from Chezhi.com, from January to October 2020, Chezhi.com received as many as 595 complaints from car owners about "water entering the lights". Most of these failures occurred in self-owned and German brand models.
If there is a problem with the sealing of the car lights, pollutants, rainwater, etc. will enter the inside of the car lights, causing a failure of the lighting system. Not only will the appearance be greatly reduced, but the safe driving of the vehicle may also be affected. As a rule, when you find such problems with your car lights, you must repair them in time to avoid affecting the normal driving of the vehicle and even increasing repair costs.
3. Why did the car lights not come on before?
As the vehicle is used for a long time, the lights will become darker and darker. Many users think that the brightness is reduced due to the reduced life of the bulbs, and they may upgrade the bulbs to LED or xenon headlights. In fact, the reason why the headlights do not light up is not entirely a problem with the light bulbs. The light transmittance of the lamp housing is also very important. Many old cars will be exposed to wind and sun for a long time, and the outer surface of the lamp housing will turn yellow. becomes rough, resulting in limited lighting distance. Therefore, even if the bulb is replaced with a brighter one, the illumination distance will not achieve the desired effect.
If you want to make the headlights brighter, the first thing to solve is the light transmittance of the light housing. Generally, it can be done using headlight refurbishment spray and sandpaper. In this article, we gave detailed instructions on the method of headlight refurbishment in this article "DIY car headlight refurbishment can be done by yourself for 30 yuan". If your The headlights of your car also appear to be "black", so why not try it yourself.
Summarize:
Under normal circumstances, fogging in the headlights is not a big deal. We only need to start the vehicle and turn on the lights. After driving for a period of time, the fog in the headlights will disappear automatically. And if your car lights are no longer simply fogging, but have water accumulation problems, they must be repaired in time. This may be water intrusion caused by poor sealing of the car lights. If the rainwater is not repaired for a long time, it may cause damage to other parts. Causes a short circuit, resulting in increased headlight repair costs.
