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Old 10-07-2016, 12:36 PM   #1
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Condensation in headlights of Itasca Meridian

Does anyone have a problem with condensation in the headlight assembly? I have about 1/8" of condensed water on the passenger side. I'm thinking of drilling a hole in the bottom to drain it out and then resealing it with silicone. Comments?
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Old 10-07-2016, 01:45 PM   #2
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Are the headlights made by Depo?
They are the largest manufacturer of oem and aftermarket headlight housings and have been known to have quality issues with sealing

You can drill a hole or you can take the headlight out and strip it down then bake it at 200* to 300* for 5-10 minutes. most recommend 225-275 for 7-13 minutes. Use wood so the oven rack doesnt damage the housing.

The sealant will soften and the whole thing will come apart. clean it out, reheat the housings and then use butyl tape to add extra sealing and put it back together.(or 3m window-weld ribbon sealer)

This is done all the time when people add the led halos to oem headlights.
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Old 10-07-2016, 02:13 PM   #3
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I don't think Depo makes any true OEM headlights. Some RV manufacturers use them, but those lights are copies of the real headlights.
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Old 10-07-2016, 02:18 PM   #4
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I forgot to mention that the bulb seal could be bad, take the headlight bulb out and make sure that it has a complete seal all the way around the rubber gasket ( some models use foam) if it looks suspect, you can leave all the bulbs out and park with the headlight so that it will get sun for most of the day, occasionally blow fresh air (you can use a computer duster can) into the housing to displace the moisture and you won't have to drill or disassemble anything. put everything back together and see if it happens again, then it might be the housing to lens seal.
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Old 10-07-2016, 02:36 PM   #5
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Quote:
Originally Posted by nukerj View Post
I forgot to mention that the bulb seal could be bad, take the headlight bulb out and make sure that it has a complete seal all the way around the rubber gasket ( some models use foam) if it looks suspect, you can leave all the bulbs out and park with the headlight so that it will get sun for most of the day, occasionally blow fresh air (you can use a computer duster can) into the housing to displace the moisture and you won't have to drill or disassemble anything. put everything back together and see if it happens again, then it might be the housing to lens seal.
Ya, I do the MDX by removing the bulb and blowing hot air in with a hair dryer...moisture goes in a few minutes. I do this about once a year, cheaper than a new headlight, especially with free campground power.
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Old 10-07-2016, 04:22 PM   #6
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Thanks for the input. It is a Depo and would not be easy to remove. I'm on the road so I drilled a hole on the bottom and let about 2 ounces of water out. I'll let it air out a day or so and maybe seal it.
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