Why Does Water or Moisture get Inside my Headlight?

Getting water or condensation buildup inside of your headlights can be a very common occurrence and could happen for a number of reasons. As you drive with your lights on, the bulbs continue to heat up. Once you stop, the cooler, moister air outside can trickle into the housings of the headlamp. The housings, on most cars, are vented at the top and bottom to allow for pressure differences that keep your bulbs and lamps from cracking and failing. When the lens of the headlight is cooler than the air inside the housing, droplets of moisture will condense inside, leaving you with water on the lens. When the outside temperature rises, the moisture usually evaporates.

Water can also leak into your headlight through cracks, busted seals or through improperly sealed housings around where the light bulbs are inserted into the back of the lamp.

While it can be an annoying and frustrating situation, there are a few easy ways to fix it in the short and long term. First, you need to examine the headlight to find the source of the problem. Check for visible cracks or holes located around the edges of the headlight. If there are no visible cracks or holes, the problem could be the housings or housing vents.

If you notice improperly fitting rubber seals you should go ahead and replace them. Also check the vents to make sure they're not clogged, which would trap condensation in the headlight, resulting in your water buildup.  Before you seal it back, you can remove existing condensation in the lamp using an air compressor and a little bit of time. Watch this video to see how to do it yourself:

While rising temperatures outside or the heating up of your headlights can sometimes fix the problem temporarily, it's still a good idea to find the root of the problem. If you can't fix it yourself, or don't want to deal with it, we'd suggest taking your car to a certified professional, like the ones at Ricart Automotive Service center and they'll get you dried up and ready to roll.

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