Moisture in Tail Lights - TerrainForum.net: GMC Terrain Forum
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post #1 of 17 (permalink) Old 04-26-2015, 11:28 AM Thread Starter
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Moisture in Tail Lights

Has anyone else had issues with moisture getting in to the tail light assemblies? Namely the inner light assemblies containing the white reverse light?

I had one replaced under warranty, and now another one has a significant amount of moisture building up in it. I have not done anything to or with the assemblies beyond replacing the bulbs with LED bulbs.

2013 Terrain SLE2

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post #2 of 17 (permalink) Old 04-26-2015, 11:32 AM
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Re: Moisture in Tail Lights

Quote:
Originally Posted by mjm9536
Has anyone else had issues with moisture getting in to the tail light assemblies? Namely the inner light assemblies containing the white reverse light?

I had one replaced under warranty, and now another one has a significant amount of moisture building up in it. I have not done anything to or with the assemblies beyond replacing the bulbs with LED bulbs.

2013 Terrain SLE2
Think maybe with the OEM bulbs they may give off more heat and keep the assemblies dry? did you switch out bulbs when they replaced the first one?

Had to go with the 18 XT5
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post #3 of 17 (permalink) Old 04-26-2015, 04:49 PM Thread Starter
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Re: Moisture in Tail Lights

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Think maybe with the OEM bulbs they may give off more heat and keep the assemblies dry? did you switch out bulbs when they replaced the first one?
Possible but I doubt it the LED ones do in fact get pretty **** hot. But even if that were the case thats a poor excuse because there is still water getting in the assembly!

Anyway, when I got the replacement assembly the first time I swapped the LED bulbs in to it and haven't had any issues with that one.

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post #4 of 17 (permalink) Old 04-26-2015, 09:27 PM
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Re: Moisture in Tail Lights

Quote:
Originally Posted by mjm9536
Has anyone else had issues with moisture getting in to the tail light assemblies? Namely the inner light assemblies containing the white reverse light?

I had one replaced under warranty, and now another one has a significant amount of moisture building up in it. I have not done anything to or with the assemblies beyond replacing the bulbs with LED bulbs.

2013 Terrain SLE2
Hey there,

If you need any assistance bringing this to the dealership's attention, please feel free to let me know! They will definitely be in the best position to provide a possible resolution. Just send us a private message along with your VIN, current mileage, contact information and preferred dealership. Looking forward to your response!

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GMC Customer Care
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post #5 of 17 (permalink) Old 04-27-2015, 01:50 AM
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Re: Moisture in Tail Lights

Just a thought-

When you switched the bulbs, was it in a humid garage (think leftover moisture from wet vehicles or temperatures changing) and then driven in a less humid spot?

Here is where I am going with this-

I purchased the OEM Projector Beam headlamp assemblies and had them installed by the Chevy dealership. They installed it in the garage and washed the vehicle in the same vicinity (The wash bay is near where the work is completed on the vehicles) thus sealing the humid garage air inside. Vehicle was then taken outside in a colder/less humid environment. Instant moisture in the assemblies.

After the humidity equalized after a few days inside the assemblies and the moisture went away.

Just a thought. Or the the seals are getting bad on your light sockets.

T

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post #6 of 17 (permalink) Old 04-27-2015, 02:12 PM Thread Starter
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Re: Moisture in Tail Lights

Quote:
Originally Posted by TylerJames
Just a thought-

When you switched the bulbs, was it in a humid garage (think leftover moisture from wet vehicles or temperatures changing) and then driven in a less humid spot?

Here is where I am going with this-

I purchased the OEM Projector Beam headlamp assemblies and had them installed by the Chevy dealership. They installed it in the garage and washed the vehicle in the same vicinity (The wash bay is near where the work is completed on the vehicles) thus sealing the humid garage air inside. Vehicle was then taken outside in a colder/less humid environment. Instant moisture in the assemblies.

After the humidity equalized after a few days inside the assemblies and the moisture went away.

Just a thought. Or the the seals are getting bad on your light sockets.

T
Nope it has been almost a year since I changed the bulb, summer time and it was done outside and the moisture is just now developing. It stays parked outside in northern NY and now as I have been washing it more regularly with warm weather moisture has been building up inside. I am going to pull the whole assembly and check the seals and make sure all the rubber is seated correctly before I put it back in after it dries out. If it can be replaced under warranty I'm going to do that otherwise I will just dry it out and see what happens after a few more washes.

Bottom line - my intent with the thread was to see if anyone else has had similar issues and if it may be systemic or as it seems I probably just did not get the seals back seated in the right spot when I put the assembly back in

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post #7 of 17 (permalink) Old 04-27-2015, 03:08 PM
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Re: Moisture in Tail Lights

mjm9536, I think I can bring you some relief:
My 2013 passenger side rear light (with the reverse light) was recently replaced under warranty due to moisture inside the lens.

My taillights are 100% OEM stock - never been touched or opened since I took delivery in Fall of 2012.

Also, if you open up the access panel for the rear in the hatch, I think you can see the wide-open vents for those rear lights. I don't think those rear lights in the hatch are of the sealed design? I did a little research before and found these lights are designed to be "ventilated" to allow moisture to come and go, but not to build up inside. It's possible a drain vent was clogged up? I didn't really look closer because mine would be replaced by warranty anyway. And I hope it doesn't come back for me!

*Disclaimer: I'm only sharing my opinion. You didn't pay for it, so my opinion is only worth that much, haha.<br />2013 GMC Terrain SLT-1, FWD, 3.6 V6 (LFX), Sunroof
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post #8 of 17 (permalink) Old 04-28-2015, 09:10 PM Thread Starter
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Re: Moisture in Tail Lights

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Originally Posted by Chas
mjm9536, I think I can bring you some relief:
My 2013 passenger side rear light (with the reverse light) was recently replaced under warranty due to moisture inside the lens.

My taillights are 100% OEM stock - never been touched or opened since I took delivery in Fall of 2012.

Also, if you open up the access panel for the rear in the hatch, I think you can see the wide-open vents for those rear lights. I don't think those rear lights in the hatch are of the sealed design? I did a little research before and found these lights are designed to be "ventilated" to allow moisture to come and go, but not to build up inside. It's possible a drain vent was clogged up? I didn't really look closer because mine would be replaced by warranty anyway. And I hope it doesn't come back for me!
Thats definitely a thought - I will check it out to see if there is any kind of drain valve or hole potentially plugged up. Its not a little condensation that would dry up on a warm day at this point. It looks like a red rainforest in there!

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post #9 of 17 (permalink) Old 04-29-2015, 12:27 PM
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Re: Moisture in Tail Lights

Yeah, I know what you mean - before I had mine replaced, there was a standing puddle of water in the bottom of the lens! It was about 1/4 inch tall!
But I did take my Terrain through the automatic car wash quite frequently in the weeks before this problem got worse. So the washes probably not doing any favors. (But none of the other rear lights had any moisture.)

Good luck! Hope you'll post an update if you find a clogged drain?

*Disclaimer: I'm only sharing my opinion. You didn't pay for it, so my opinion is only worth that much, haha.<br />2013 GMC Terrain SLT-1, FWD, 3.6 V6 (LFX), Sunroof
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post #10 of 17 (permalink) Old 04-29-2015, 12:30 PM Thread Starter
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Re: Moisture in Tail Lights

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Originally Posted by Chas
Yeah, I know what you mean - before I had mine replaced, there was a standing puddle of water in the bottom of the lens! It was about 1/4 inch tall!
But I did take my Terrain through the automatic car wash quite frequently in the weeks before this problem got worse. So the washes probably not doing any favors. (But none of the other rear lights had any moisture.)

Good luck! Hope you'll post an update if you find a clogged drain?
Haven't had the opportunity to look yet but I will post after I do open it up and look again.

I am probably a victim of the same thing - warm(ish) weather I hand wash but through the winter at least 2-3 times a month I run it through an automatic car wash to try and slow the natural decay of all cars in northern NY winters.

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