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But if you are experiencing large amounts of condensation or water buildup inside of the headlight then you need to inspect your headlight to see what is causing so much water or condensation to form. Small amounts of condensation inside of headlights is normal because most headlights have vents that allow outside air to enter the headlight.

If that silicone sealant cracks or was improperly applied when the headlight was made it can allow large amounts of condensation or water to enter into the headlight which is not good for the headlight overall. The headlight lens will be mounted on the headlight assembly with the outer edge sealed with silicone sealant. As your car’s headlights cool off after you are done driving the outer lens will cool faster than the interior headlight housing which then cools down the rising water vapor and causes condensation to form inside of the headlight.Īnother way that condensation or water can get inside of the headlight is a cracked or broken seal on the headlight assembly. As you drive around the headlight housing will become hot (causing air to rise inside the headlight) because of the heat generated by the headlight bulbs. If you didn’t know condensation occurs when hot air rises and then cools down, losing its ability to hold water vapor. These vents are usually the cause of condensation inside of headlights. Since headlights generate heat most headlights have vents that allow hot air to escape the headlight and cool air to enter.

Why Is There Condensation in my Headlights?Ĭondensation can get into your headlights in a couple of different ways. But that silicone sealant can become brittle and crack over time allowing condensation or water to form inside of your headlights. Headlight housings and headlight lenses are then sealed together using a silicone sealant that’s designed to keep water from entering the headlight assembly. Headlight lens’ are designed to keep water and other debris from entering the headlight housing. The headlight housing contains the headlight bulbs and the electrical connections to allow your headlights to illuminate. Headlights are comprised of two pieces the headlight housing and the headlight lens. What’s the Best Way To Fix Condensation in Headlights? How Are Headlights Made?