How to judge whether the car headlights are fogged or flooded?

How to judge whether the car headlights are fogged or flooded?

Many drivers will encounter water in the headlights of their cars, and they look like the car is crying and aggrieved. So what is the situation?

The car headlights emit heat when they are lit and illuminated, so from a structural point of view, there will be a vent hole behind the headlights, which can be used to discharge the heat emitted by the headlights. So as to ensure the normal working temperature of the headlights. This phenomenon is especially obvious in the autumn and winter seasons, or the rainy summer and autumn weather, in fact, the moisture in the air enters the headlights through the ventilation holes and adheres to the lampshade. Because the outside temperature is low, but the temperature inside the headlight is very high, it is prone to temperature differences and water vapor.

car headlights

How to distinguish whether the car headlights are fogging or flooding?

The external performance of headlight fogging and water ingress is different. If you want to judge whether the headlight is flooded or fogged, there is a way to make a preliminary judgment, which is to check the traces of water flow. Fogging is generally a film or dew formed on the surface of the lampshade of a car headlight, with no trace of water flow. The ingress of water is due to the large amount of water, which condenses into dewdrops and flows from the top of the headlights to the bottom of the headlights. This will form obvious water traces. Like a waterfall, even if the water is dry, there will be some traces, like a snail passing by. The road will have the same traces.

If this method is used to judge, many car owners will feel very confused and may have wrong judgments. Therefore, there is another way. When the fog inside the car lights appears, it takes about 1-1.5 hours for the fog to be completely eliminated when the lights are on; in a static state, store for 24 to 36 hours in a dry environment with a humidity of <50%. The internal fog can be completely eliminated automatically, this phenomenon is fogging. If a large area of ​​fog condenses on the inner wall of the lens and condenses into water droplets, it accumulates inside the car light. When the car light is used for a long time and many times, as the temperature rises, the fog will adhere to the inner surface of the lens in a large area. This phenomenon should be judged as water ingress.

The impact of fog and water in the car headlights on the vehicle is very large. It will not only affect the safety of night driving, but also may cause problems with the vehicle line due to excessive water ingress, so we must pay attention to it. Especially in the summer and winter seasons when the moisture is relatively abundant, it is even more important to develop a good habit of regularly checking the headlights of the vehicle.