Moisture in Tail Lights - Page 2 - TerrainForum.net: GMC Terrain Forum
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post #11 of 17 (permalink) Old 05-03-2015, 02:50 PM Thread Starter
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Re: Moisture in Tail Lights

No luck finding any kind of vent/drain or opening that air and or water would be getting in to in the tail lights on the lift gate but the water in mine does seem to be evaporating now that it is getting consistently warmer outside.

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post #12 of 17 (permalink) Old 10-15-2019, 09:24 PM
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I'm having the same problem with my 2017 Terrain - passenger side backup light lens took on water after a rain. Noticed water leaking from the inside panel, removed panel and dried out moisture and left the panel cover off to circulate air. Moisture still collecting in the base of the clear lens. I suspect the seal around the lens housing is leaking. 41000 miles and out of bumper-to-bumper warranty so no luck there. I may try some silicone caulk around the lens housing. Would appreciate any advice for other possible fixes.
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post #13 of 17 (permalink) Old 11-09-2019, 11:57 AM
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Originally Posted by peegee12 View Post
I'm having the same problem with my 2017 Terrain - passenger side backup light lens took on water after a rain. Noticed water leaking from the inside panel, removed panel and dried out moisture and left the panel cover off to circulate air. Moisture still collecting in the base of the clear lens. I suspect the seal around the lens housing is leaking. 41000 miles and out of bumper-to-bumper warranty so no luck there. I may try some silicone caulk around the lens housing. Would appreciate any advice for other possible fixes.
Let me know how that works out, my 2014 has water in the driver's side clear backup lense also.

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post #14 of 17 (permalink) Old Yesterday, 04:08 PM
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Let me know how that works out, my 2014 has water in the driver's side clear backup lense also.
I bought a 2013 GMC Terrain and found water to be building up in the passenger side clear lens as well as the red one. Want for service Friday Nov.15 and asked to get the mechanic to check if he could find where the water was coming. Service manager came back and said the mechanic found water to be coming from a bad rear wiper seal(). Form looking inside the hatchback panel it doesn't seem that this would be possible,in any event they didn't have the seal in stock so did not fix fox 55.00$. Can anyone find any credibility in this solution?? Thanks... Ray
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post #15 of 17 (permalink) Old Yesterday, 04:29 PM
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My 2013 Terrain has that problem, went for service Nov 15 and asked to get it checked out. Service manager came back and said the mechanic found water to be coming from bad seal on rear wiper. From looking inside the panel opening I can't really see how this would be possible. Does anyone see any credibility in this solution? Did not get work done because the seal was not in stock (55.00$). Thanks.....Ray4
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post #16 of 17 (permalink) Old Yesterday, 04:30 PM
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Sorry about double post newbie!!
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post #17 of 17 (permalink) Old Today, 06:56 AM
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Why not add a little clear silicone under / on the edge of the rear wiper seal then see if that is the problem if so, replace with new seal ? Or, simply order and install the seal yourself, sounds like the tough job of locating the source is now done. A little bit of silicone is a cheap test to verify that is the source.
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