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Car owners|How to deal with foggy car lights

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In seasons with large temperature differences between morning and evening, the water vapor evaporated by residual heat during the day condenses into fine water droplets when it encounters cold at night. The small water droplets adhere to the car lights, causing fogging and reducing the brightness of the car lights. This is more common in autumn and winter. What should we do when our car lights fog up? In this issue, Car Owner will tell you these tips for defogging your car lights.

Car owners|How to deal with foggy car lights 1

Why do car lights fog up?

The car headlight itself is not a completely sealed structure and has vents to balance the internal and external air pressure. Under appropriate conditions, such as when a vehicle is driving on a rainy day, the temperature on the inside of the glass lampshade rises due to the light and heat generated by the light bulb, and the water droplets vaporize; the temperature on the other side cools sharply due to rain erosion, and the water vapor contained in the air condenses and adheres to the On the glass lampshade, the car lights condense and fog up.

How to deal with foggy car lights

If your car lights fog up, you must first investigate the cause.

  1. Check whether you have driven in rainy days, waded in water, or washed your car recently. If you have driven in rainy days, waded in water, or washed your car, the fog in the headlights is likely to be caused by water intrusion.
  2. Check if the headlight is damaged. During normal driving, the headlights may be damaged due to being inadvertently hit by stones thrown by other vehicles; the lampshade may also be scratched by other vehicles, causing cracks, making it easier for water vapor to enter.
  3. There is a problem with the lampshade seal. If the lamp dust cover is not damaged or cracked, there may be a problem with the gasket. Because the seal is not tight, water vapor can penetrate into the lamp, causing fogging. This factor is not so intuitive to check, and you need to go to a car service store to check.
  4. The factor of water condensation. If it is not due to rain, wading, or car washing, it may be due to the hot and cold temperature difference caused by the weather, which causes condensation to condense on the lampshade and form water mist. Just like when we drive in summer and winter when the temperature difference between indoor and outdoor is large, condensation will condense on the car windows. Generally, this happens when we use lights. However, as the lighting system is used longer, the fog in the car lights will slowly dissipate. If the fog persists, there may be a problem with the lampshade and gasket, and you need to use the above method to troubleshoot.

Once we find out why the car lights are fogging, we can use these methods to dispel the fog:

  1. Turn on the car lights and let the heat generated by the lights bake them. The mist will naturally dissipate when heated.
  2. If the fog is heavy and during the day, sunlight can be used to increase the ambient temperature, and the fog will slowly dissipate, and even heavy water vapor will slowly evaporate.

How to deal with water entering car lights

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If the sealing performance of the car lights decreases due to aging, or the lamp cover is damaged or cracked, water vapor and dust will enter the car lights, which will not only affect the appearance of the car lights, but also cause the lighting effect to decrease, seriously affecting the safety of driving at night or on rainy days. may short-circuit electronic circuits. Therefore, when water vapor enters the car lights due to the above situation, corresponding repairs and treatments should be carried out in time, and accessories should be replaced.

We can judge whether the car lights are filled with water or fogged based on the traces of water flow. Fogging will generally form a layer of fine water droplets on the surface of the lampshade, with no trace of water flow. If water enters the car lamp, the amount of water vapor will be relatively large, and it will condense into dewdrops and collect under the lampshade, with obvious traces of water flow. Even if the water evaporates and dries, there will be traces.

Secondly, we can also judge by whether the fog will dissipate on its own. Normally, for fog, the fog will dissipate after about an hour of operation of the car lighting system; when the vehicle is parked in a relatively dry underground garage, the fog will gradually dissipate in one to two days. If water enters the car lights, the amount of water vapor is relatively large and cannot be completely dissipated and accumulates inside the car lights. When the car lights are used for a long time and many times, as the temperature rises, the mist will reattach to the parts. The inner surface of the light mirror.

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During daily driving, in seasons with large temperature differences and humidity, attention should be paid to regular inspections of the vehicle's lighting system. Generally speaking, as long as it is not fogging inside the car lights, but only fogging on the inner surface of the lampshade, it is a normal phenomenon. Usually, after the car lights are turned on for about an hour, the fog in the area illuminated by the lights can be completely dissipated. At the same time, the fog in other areas will also basically dissipate, without affecting the normal use of the car lights.

(The content of this article is compiled from the Internet. If there is any infringement, please contact the author to delete or change it.)

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