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'08 STS-V Sedan Black Formerly three CTS-V's, XLR and STS4N*
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Discussion Starter #1
Monsoon season arrived in Detroit this weekend and my trunk LID is filled with water (not my trunk). I can only assume the water is entering through either the center brake light or reverse light area but that is just a guess. Anyone else experience this issue and know where it entered and the fix? This is a good amount of water perhaps 6-12 oz. sloshing around in the lid.
 

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06' STS V
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Monsoon season arrived in Detroit this weekend and my trunk LID is filled with water (not my trunk). I can only assume the water is entering through either the center brake light or reverse light area but that is just a guess. Anyone else experience this issue and know where it entered and the fix? This is a good amount of water perhaps 6-12 oz. sloshing around in the lid.
Probably from the mounting holes for the rear fin...
You could remove it and use some weather stripping along the edge to divert the water to the ends....
 

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08 STS4 V8 1SG & 04 SRX4 V8 & 01 Monte SS
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For the base STS this common issue has been typically due to the foam seals around the reverse lamps and / or the license plate mounting points. Occasionally this is due to the CHSML (3rd brake lamp) as the V series spoiler has the light pass through it I suppose that may increase the chances that the brake lamp or spoiler is at fault.

But I'd start with the easy ones being the backup lamps and license plate mounts.
 

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'08 STS-V Sedan Black Formerly three CTS-V's, XLR and STS4N*
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Discussion Starter #4
I bet it is the CHSML. It seems loose on one end as I push around on things. Hope it is not broken. I have a feeling that is not a cheap part. Thanks.
 

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'79 coupe deville, '04 Deville DTS White Lightning
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There is actually a tsb for this that applies to generation 2 Cts and the Sts. And the issue is the license plate mounting grommets. But as Luda says, this isn't necessarily the problem in your case.
 

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'08 STS-V Sedan Black Formerly three CTS-V's, XLR and STS4N*
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868 Posts
Discussion Starter #6
Hmm. I opened up the area last night and looked around. The CHSML is loose on one end but there are no broken tabs or anything. I could not find anything out of the ordinary. Pulled the drain plugs and will let it bake in the sun until dry. Perhaps it is the TSB. Thanks.
 

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2006 STS-V, 2004 Pontiac GTO, 2008 Pontiac G8 GT, 1999 Chevrolet Suburban LT 4x4
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The drivers side of my third brake light pops out (have yet to glue it back into place), so look for that as mentioned, otherwise, the back-up lights.

I don't recall if there are little rubber bump stops on the bottom of the lid (where it would meet the rear bumper cover), but if it does, sometimes removing them will allow the water to drain. Once done you can put them back in.
 

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'08 STS-V Sedan Black Formerly three CTS-V's, XLR and STS4N*
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Discussion Starter #9
Actually those bump stops will not allow the water to drain. There are two small drain plugs at the very far lower edges of the lid that will allow all of the water to drain.
 

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2006 STS-V, 2004 Pontiac GTO, 2008 Pontiac G8 GT, 1999 Chevrolet Suburban LT 4x4
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Yea, I figured that there had to be a way to drain it either undoing the bump stops or the little plugs. GM does think of these things.
 

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2018 Camaro 2SS/NPP/F55/AQJ, Sold: 2015 Camaro, 2006 STS (EXP) 1997 Seville STS (EXP)
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...the little plug far right on the picture (and also one left) ...bump stops won't help... ;)
 

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06 STS-V, 06 DTS Performance - Past 91Broughamd'Elegance,76FWBd'Elegance,98STS,00Eldorado,06STS
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I had the same issue on both sts's i had. I removed those little rubber plugs (not the bump stops) and put them in the front ashtray. haven't had that problem since!
 

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Because water will find it's way in regardless of how well you attempt to seal it.
 
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