Causes and solutions of fogging inside car headlights.

Causes and solutions of fogging inside car headlights.

According to the analysis of the overall structure of the car headlights, whether it is ordinary halogen headlights, xenon headlights, or headlights with LED lamp groups, there is a vented rubber tube on the back cover position. When the headlights are lit, In an instant, even when the headlights are in use, they will generate a lot of heat, and the function of the vent pipe is to exhaust this heat as much as possible outside the headlights to maintain the normal working temperature of the headlights, thereby ensuring the stable use of the car headlights.

First, the reasons for the fogging of car headlights:

Moisture in the air will enter the headlight through the vent pipe and will attach to the lampshade. As the water vapor gathers, water drops will flow down the lampshade. The reason for this situation is mostly caused by large temperature differences, and this phenomenon is most likely to occur in winter and rainy seasons. When the car lights are turned on for a period of time, the fog will be discharged out of the lights through the vent tube along with the hot air. This situation basically does not damage the headlights and electrical circuits.

car headlights

In view of this situation, the driver must not act rashly, for example, must not bake the car headlights, if the operation is improper, it is easy to damage the headlights. In addition to weather factors, human factors can also make car headlights like this, such as car wading, car washing, etc. When the vehicle is wading, because the engine and exhaust system itself are relatively large heat sources, a large amount of water vapor will be formed when rainwater falls on the water surface. Along the air pipe, part of the water vapor will enter the headlights. Car washing is more straightforward. Some car owners like to use high-pressure water guns to flush the engine compartment. After flushing, the accumulated water in the engine compartment was not treated in time. When the engine compartment cover was closed, the water vapor did not quickly dissipate to the outside of the car, which caused the water vapor in the engine compartment to enter the headlights.

Second, how to distinguish between water ingress and fogging?

Under normal circumstances, most people know how to distinguish whether headlights are flooded or foggy. When they see water droplets, they will think it is flooded. In fact, there is one way to make a preliminary judgment, and that is to check for traces of water flow.

Everyone knows that if water enters the headlights of a car, it usually enters the water from above the headlights and then flows under the headlights. This will form obvious traces of water flow. Even if the water dries, there will be some traces. You have experience People can still see it.

Third, how to solve it?

If you see that the car headlights are only forming water vapor underneath, and the upper part is very clean, then it is generally a foggy condition. At this time, it is recommended to turn on the headlights and dry the water vapor inside by turning on the lights. Normally, one week is enough. Or, idling in place, turning on the headlights for a long time or connecting the charger and turning on the headlights.

For the cleaning work in the engine compartment, a rag should be used for wiping or a high-pressure air gun should be used to avoid “moisture-related” phenomenon in the engine part as much as possible. If the water accumulation inside the headlight of the car is very serious, it should be disassembled immediately and the lamp cover should be opened. When it is dry, check the surface of the headlight for damage or other leakage. If there is nothing abnormal, it is recommended to directly After replacing the headlights, cover the sealing strips and vent pipes.