Is it normal for headlights to fog up, about is it normal for headlights to fog up

It is relatively common for water mist in car headlights, whether it is a halogen lamp or not, the water mist in the lamp can be divided into two situations. One is normal and the other is abnormal, let's find out.

The main reason for the fogging of vehicle headlights is that when the temperature in the lamp drops sharply, the external high humidity air enters the inside of the lamp, and when the hot air in the lamp meets the cold lamp cover, it will liquefy into small water droplets and attach to the inner wall of the lamp cover, forming the fog we see. In order to ensure the balance of the internal and external pressure of the headlamp, the headlamp assembly is designed with a vent with dustproof function, under normal circumstances, when the temperature of the lampshade is equivalent to the temperature of the hot air in the lampshade, there will be no new fog, and the fog that has been generated will slowly evaporate and disappear at this time, which is a normal phenomenon.

If it is severe fogging (fog forming water droplets, water ingress, etc.), the cause of this kind of failure is generally due to cracking of the headlight assembly, the dust cover is not properly covered, the dust cover is broken, the sealant is aging, and so on. After driving the car, the temperature in the headlights is still very high, a large amount of high-humidity air enters, and the outdoor temperature is relatively low, and a layer of water mist will condense in the headlight assembly. The next morning, it will be foggy and even water droplets gather into a puddle of water in the lamp, which will seriously affect the lighting effect of the headlights and cause unsafe driving.

Photo by Cheng Mingde) @2019

Hello, normally speaking, it is normal for us to have a slight fog in the headlights, if it is very serious, if there are water droplets in it, it is a water leak, water ingress.

The reason for the fogging of the headlights is mostly due to the high humidity of the air, which causes the water vapor in the air to condense in the headlights. At this time, it is normal for the headlights to fog up, and the reason for the fogging is only related to the humidity of the air, not due to car washing, rain, snow, etc. Generally, the water vapor condensed by the headlight fogging is not very much, and after turning on the headlight for 15 minutes, the water vapor will evaporate and will not remain in the headlight.

It is normal for headlights to fog up.

Heat is generated when the lights are turned on, and because the headlights are in a relatively confined space, the air inside the headlights is heated into water vapor, forming a fog.

Add air vents above the heat source, and then use breathable cloth to stick waterproof, the function of the breathable cloth is to prevent water from entering the lamp, and the heat in the lamp can be emitted through the breathable cloth; A desiccant is placed inside the headlight, and the desiccant can attract a certain amount of moisture

Usually when encountering fogging, as long as the headlights are used normally for about a week, they will completely dissipate, if it is particularly serious, you can open the back cover of the headlight waterproof cover, turn on the headlights, let the xenon lamp dry the fog inside, and then cover the waterproof cover after cooling.

High intensity discharge refers to a high-pressure discharge lamp that is filled with an inert gas mixture including xenon and does not have the filament of halogen lamp, referred to as HID xenon lamp, which can be called metal halide lamp or xenon lamp, and is divided into xenon lamp for automobile and xenon lamp for outdoor lighting.

Xenon lamps are also called HID gas discharge headlamps in the field of automotive lights. It replaces the traditional tungsten filament with high-pressure xenon gas encapsulated in a quartz tube, providing higher color temperature and more concentrated illumination.

Causes of fogging of car headlights:

1. The moisture in the air will enter the headlamp through the ventilation tube and attach to the lampshade, and with the accumulation of water vapor, the water droplets will flow down the lampshade;

2. This situation is mostly caused by large temperature differences, and this phenomenon is most likely to occur in winter and rainy seasons;

3. In addition to changes in the weather, human factors will also make the lights foggy, such as vehicle wading, car washing, etc. When the vehicle is sensitive to water, because the engine and exhaust system itself are relatively large heat sources, rainwater will form a large amount of water vapor on the upper bridge brother, and along the ventilation pipe, part of the water vapor will enter the headlights.

The reasons for the fogging of the headlights are as follows:

1. If the headlamp dust cover is not well sealed, you can open the dust cover for drying and check whether the lamp cover seal is complete;

2. The water mist in the headlights of the car is generated in humid weather, and it can be dried in the sun to eliminate the water mist;

3. If the sealing cover of the headlamp cover is damaged or the sealing strip falls off, and the water mist caused by water ingress needs to go to the maintenance or repair shop for repair or replacement.

Summary. Hello, the problem of headlamp fogging is because the moisture in the air will enter the headlight through the snorkel and attach to the lampshade, and as the moisture gathers, the water droplets will also flow down the lampshade. And this situation is mostly caused by large temperature differences, winter and rain-prone seasons are most prone to this phenomenon, such as the headlights are only formed below the water vapor and the top is still very clean, then it is usually a normal situation of fogging, it is recommended that you can often turn on the headlights, by turning on the lights to dry the water vapor inside, normal use for a week can be dissipated.

You can also idle in place for a long time, turn on the headlights, or connect the charger and turn on the headlights, do you still have any questions that I need to answer for you?

Hello, the problem of headlamp fogging is because the moisture in the air will enter the headlight through the snorkel and attach to the lampshade, and as the moisture gathers, the water droplets will also flow down the lampshade. This situation is mostly due to the large temperature difference caused by the brother, winter and rain-prone seasons are most prone to this phenomenon, such as the headlights are only formed below the water vapor and the top is still very clean, then it is usually a normal situation of fogging, it is recommended that you can often turn on the big and the lamp, by turning on the light to dry the water and dust inside, and the normal use can be dispersed for a week. You can also idle in place for a long time, turn on the headlights, or connect the charger and turn on the headlights, do you still have any questions that I need to answer for you?

My golf 8gti, every time it rains and drives, there will be a light noise shed slightly fogged, and it will dissipate after a few hours.

Hello, this does not turn off the LED light relationship oh dear.

It is because the moisture in the air will enter the large closed belt lamp through the ventilation tube and attach to the lampshade, and as the water vapor gathers, the water droplets will also flow down the lampshade He finger. And this situation is mostly caused by large temperature differences, check whether the headlights are broken, and the lampshade is not tightly sealed. If the headlight dust cover is not damaged or cracked, it is likely that there is a problem with the sealing gasket, because the sealing is not strict, resulting in water seepage from the headlights, resulting in fogging.

For example, if the temperature is very high today, and I turned on the air conditioner in the car very low, is it also possible?

This rarely happens in the headlights, and this is the case that the indoor air conditioning does not affect the headlight cover.

It's really slight, but it's always uncomfortable in my heart, and I've asked in the store, as long as it can dissipate, it's normal, right.

In your case, the light cover is usually not tightly closed.

Yes, it's okay if it dissipates.

<><01 Troubleshoot the cause.

To determine the cause of the headlights fogging, first rule out whether there have been recent cases of driving in rainy weather, wading in water, or having washed the car. If you are driving, wading, or washing your car in rainy weather, then the fog from the headlights is likely to be caused by water ingress, so check it first.

02Check whether the headlights are damaged.

In normal driving, you may not be paying attention, and you may be crushed by other vehicles and collide with the headlights. Or when the car is parked in the parking lot and you are not at the scene, the dust cover of the headlight has been scratched, so the lampshade is damaged, there are crack lights, etc., check the shirt carefully first.

03 The lampshade is not tightly sealed.

If the headlight dust cover is not damaged or cracked, it is likely that there is a problem with the sealing gasket, because the sealing is not tight, resulting in water seepage from the headlights, resulting in fogging. This needs to go to the professional maintenance department of the car to check and deal with it.

04 Water condensate.

If it is not rain, wading or branch water, the reason for washing the car, it is because of the temperature difference between cold and hot caused by climate reasons, and the water condensate generated. Just like when we drive normally, when the outside temperature is relatively low and the temperature inside the car is high, condensation will form on the windows. Generally, this situation occurs when we use the lights, but this situation is only occasional, and after the heat, the fog in the headlights will slowly dissipate.

If this phenomenon always occurs, it is still a problem with the lampshade and gasket, which needs to be further investigated.

05 fogging method.

If there is a slight fog in the headlights, you only need to turn on the headlights of the car and bake it, and the fog will slowly evaporate when it is heated.

06 Sunlight exposure.

If the fog in the headlights is heavier (to be exact, it is water), then it is more troublesome to rely on the light of the headlights to bake, it is better to drive the car to a place where there is sunlight, and use the ultraviolet heat of the sun to slowly evaporate the fog of the headlights.