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Why does fog appear in car headlights? It turns out this guy is causing trouble

Nowadays, car headlights have become a hard need for car owners. This does not only refer to car headlights, but also what type of car headlights are equipped. Of course, car headlights are a guarantee of safety when driving at night. That is why many car owners dislike the dim original halogen lights and think of modifying xenon headlights. This also shows that our requirements for car headlights are still quite high, but in autumn and winter we will always encounter such a problem-fog will be generated inside the headlights.

Why does fog appear in car headlights? It turns out this guy is causing trouble 1

The occurrence of fog inside the headlights has become a very common phenomenon, and almost most car owners have encountered similar situations. It is most noticeable after driving for a period of time in the morning, and is also more common in dry seasons when there is more rain. It is very annoying to see a layer of fog inside the headlights, and in severe cases, water droplets will form inside. Could it be that the car headlights are not tightly sealed, or are there cracks in the headlights?

Why does fog appear in car headlights? It turns out this guy is causing trouble 2

It is not difficult to see from the structure of the headlights that whether they are halogen headlights, xenon headlights or LED headlights, the inside of the headlights are almost sealed with sealing strips. Usually, when changing car light bulbs, they can also be changed in size. When disassembling the headlights, When you remove the back cover of the lamp, you will find that there is a layer of sealing strip on the headlight. This sealing strip is the first way to prevent water from entering the interior of the car headlight. In addition to this method, there is also a vent hole inside the headlight for internal ventilation of the headlight, but there is a treatment method similar to monotonous cotton at the vent hole to filter the air entering the interior of the headlight. From the above two methods, it is not difficult to see that the actual factors causing fog inside the headlights are located. The first point is that the sealing strip of the back cover of the headlight has aged after being used for a long time or the sealing strip was damaged during the disassembly process. The second point is whether the dry cotton at the vent is still intact (the effect will also decrease over time).

Why does fog appear in car headlights? It turns out this guy is causing trouble 3

When the car headlights are turned on, they will emit light and generate a lot of heat. The air inside the headlights will expand and the air will be discharged through the headlight vents. When the headlights stop working, the internal air cooling needs to be compensated by external air. At this time, the dry cotton at the vents plays a certain role. It can filter out the moisture in the air to ensure that the interior of the headlights is dry. However, under normal circumstances, although there will be Moisture enters the inside of the headlight, but it does not combine to form such a large fog inside the headlight, and the heat radiated during driving is enough to discharge the moisture inside. Faced with this effect, special situations cannot be ruled out. Therefore, the most direct cause is that the rear part of the headlights is not tightly sealed and is aging. Similarly, if the humid air after the headlights are turned off does not enter through the vents but through the loosely sealed rear cover, the effect is clearly caused by the car. After a period of time, you will find that water mist occurs inside the headlights, which is also related to the season and the temperature difference between day and night.

Why does fog appear in car headlights? It turns out this guy is causing trouble 4

Therefore, when you find water mist inside the headlight, you should start from the above two aspects and check the sealing strip at the rear of the headlight and the dry cotton at the vent. If it is found that the sealing is not tight, sealant can be used to seal it separately. Car owners must also be careful not to break the sealing strip when changing the light bulbs themselves. As for blowing with a hair dryer after the fog appears, it will not solve the original problem. Also, do not directly bake the headlights at high temperature to complete the internal defogging of the headlights, which is very likely to cause serious damage to the headlight shade.

Therefore, don't underestimate the small sealing strip, which controls the lifeblood of the headlight. Fogging inside the headlights is generally more common in cars with higher mileage. What should I do if someone reports that this problem also occurs in new cars? I can tell you responsibly that if the car is within the warranty period, you should file a claim as soon as possible. This is a quality problem.

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