When it rains or the temperature difference is too large, the lights will fog. Why?

First of all, it is very common to make it clear that the car lights are fogged on rainy days or when the temperature difference is too large. Normally, it's nothing serious.

Because there is a ventilation pipe behind the headlights of the car, generally speaking, this ventilation pipe has the function of heat dissipation, but if water vapor enters through this radiator pipe, it may stay in the headlights. If it is cold in rainy days, the environment inside the lamp is generally hotter than outside. At this time, the water vapor in the lamp will stick to the lamp wall, because the lamp wall is connected with the outside world. Low ambient temperature will lead to low lamp wall temperature, and water vapor will condense into small pieces when it meets the lamp wall.

If the headlights are used for a long time, it is possible that the sealing strip of the headlight assembly is not tightly sealed. If so, it will also lead to water vapor in the lamp. Moreover, if the seal is particularly lax, it will not only fog the headlights, but may even leave large water droplets on the headlights. In this case, it is recommended to go to the 4S shop for maintenance or repair the headlights in time, because if the headlights are broken during driving, it may affect our driving.

If this situation is minor, there is no need to be too flustered. As long as this situation is not particularly serious, this foggy phenomenon will disappear if the light is turned on for more than 15 minutes. Therefore, if this situation is minor and does not affect normal driving, you can temporarily ignore this problem, but you must observe whether this situation is further aggravated. If it is further aggravated, it is recommended to hand it over for maintenance.

In addition, we should try to avoid the car staying in a humid environment for a long time, which will not only cause such bad damage to our headlights, but also damage other parts of the car because of too much water vapor and humidity. Because the whole car is made of metal, metal is generally afraid of water vapor, so we should try to keep the car in a dry environment, which is more conducive to the maintenance and long-term use of the car.

Therefore, in rainy days or when the temperature difference is large, the headlights are foggy. This is because some water vapor enters the headlights in the radiator pipe behind the headlights. At this time, the outside temperature is too low, which causes the water vapor in the headlight to stick to the lamp wall and condense into small water droplets after precooling. Countless water droplets form a fog to your naked eye. Generally, there is no need to panic in this situation. After turning on the light for a while, the water vapor will disappear. But if the fog is particularly serious, even small water droplets will affect the normal.