1. The headlights are foggy or have water droplets on them
Xiao Wang bought a car not long ago. The freshness of buying a car made him stare at the car and think about it whenever he had nothing to do. One night, he suddenly saw fog in the car's headlights. He thought the headlights were filled with water. He thought it was no wonder the car's light was weak. He was ready to go to the 4S store to hold him accountable. He thought he would have to pay compensation for whatever happened during the warranty period. After being reminded by an experienced driver, I learned that headlight fogging is actually a normal phenomenon. This phenomenon is most likely to occur in winter and rainy seasons.
The reason why headlights fog up is mostly due to high air humidity, which causes water vapor in the air to condense in the headlights. This water vapor is usually not much, and the water vapor will evaporate after the headlights are turned on for a period of time. So many people will ask: The entire lampshade of the car headlight should be sealed, how can the moisture from the outside get in?
It is true that the entire lampshade is sealed, but this does not mean that the inside of the lampshade is completely isolated from the outside world. Firstly, because future repairs have to be considered, and secondly, the car lights will generate heat when they continue to work. From the perspective of heat dissipation, the lampshades also need to undergo some special treatment.
Many headlights will have a ventilated rubber tube on the back cover. It is through this vent tube that the heat generated after the headlight is turned on can be discharged, thereby keeping the headlight temperature normal and always in a relatively stable working environment. It is also because of this breather tube that the moisture in the air can enter the interior of the headlight and be adsorbed on the surface of the lampshade. After "gathering", it will flow down from the lampshade in the form of water droplets. After the car lights are turned on for a period of time, the fog will be discharged from the ventilation pipe along with the heat wave, and will not cause damage to the headlights and circuits.
In addition, in addition to situations of high humidity and large temperature differences, if the accumulated water is not cleaned up after wading in the vehicle or cleaning the engine compartment, moisture may enter the headlights through the rubber breather pipe. Generally, you do not need to pay special attention to these situations. As the headlights emit heat, the water will naturally evaporate.
2. Make sure the headlights are sealed when water enters them.
There is no need to pay special attention to the fact that fog occasionally appears on the surface of the lampshade and can be dissipated in time. However, what if there are a lot of water droplets inside the headlight and it cannot be discharged even for several days? At this time, you have to consider the possibility of water entering the headlights.
If you find that your car's headlights always have a lot of fog and water accumulation in rain or snow or after washing the car, then you should consider replacing or resealing the headlights. If left alone for a long time, the normal use of the headlights will be affected, and the headlight bulbs may even burn out.
Maintenance is usually done like this: open the lamp cover and check whether there is any damage on the surface of the headlight or the back cover. Check whether the vent pipe has fallen off and whether there is any problem with the sealing strip. If necessary, replace it. If it is confirmed that there is no damage, you can peel off the lampshade and headlight assembly and dry them separately before resealing them.
Here again, I would like to remind everyone that when washing their cars, some car owners like to use a high-pressure water gun to directly flush the engine compartment. As mentioned before, the accumulated water after flushing is not treated in time, which causes the accumulated water to flow along the ventilation rubber pipe. Go inside the headlight. Therefore, when car owners usually clean the engine compartment, it is best to wipe it with a sponge or cloth, or after cleaning, they can use a high-pressure air gun to blow into the corners of the cabin that are prone to moisture accumulation to take away the moisture accumulated in dark corners and avoid as much as possible. The engine area gets damp, causing the headlights to fog up or get water.
