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Everyone has this habit, when you are inspecting or enjoying your vehicle in detail, the last thing you want to see is to check... Why Your Headlights Get Moisture In Them

Jeep Wrangler headlight

Everyone has this habit, when you are inspecting or enjoying your vehicle in detail, the last thing you want to see is to check your headlights out whether there is water vapor in them. Sometimes, you will find there is moisture inside your headlights lens. But don’t be afraid. This moisture doesn’t mean your headlights are defective or broken. It also doesn’t mean you need to buy a new pair of headlights to replace the original ones.

You may want to know how that moisture gets inside your headlight, which related to the physical knowledge, called condensation.


Condensation happens when the outside of the lens is cooler than inside the lens. When you drive around with lights on for a few hours, the bulbs warm the air inside the headlight lens. The same thing could happen when the headlights sit out in the sun all day.



Moisture inside the headlight

So now the air inside the headlights is warm. If you turn your lights off or pull your vehicle into the shade, there will be a large temperature difference between outside and inside the lens. The cool air wants inside and it begins to sneak into the tiny vents that are found on most headlights. When that cool air meets with the warm, condensation is formed. That happens on the warm side of the lens, so you have got a little layer of moisture on the inside of the headlight lens.


But almost every headlight has a vent tube. This allows large amounts of heat to exhaust. If you turn the lights on or pull your vehicle back into the sun, the moisture will eventually evaporate through the vent tube.


There is another reason that your headlights could be filled with condensation. The bulb socket boots may not be seated properly. When the headlights are on and hot, that heat will pull moisture in through those tiny spaces where the boot isn’t sealed right. Thus, to fix this problem, you just remove the bulb and the seat and then install it correctly. If the boots are broken, you need to buy a new one to replace it.


If you’re seeing a lot of water inside your headlights, it means the seal around your bulbs or headlights isn’t working properly. There could be rain water dripping into your headlights. Or you wash your vehicle with an inappropriate way, causing water to flow into the inside of the headlights. You will have to remove the bulbs and check the seal around them. Sometimes, when replacing your headlights with new ones, those seals fall off or just don’t seal back like they should do. Get some new ones and your headlights will stop taking on water.

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Jessica Chen

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