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'08 CTS Black Raven/Ebony 3.6DI FE2 6-speed manual
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Discussion Starter #1
With some medium to heavy rains lately this spring I am seeing something I don't remember from the summer / fall - the spare tire well has twice now ended up w/ a inch or so of water. It looks like its coming in from the left rear corner as the flat section there by the tail light is wet as well and water has wicked along the left side of the trunk slightly. The weather stripping/seals all look intact though which is a head scratcher. This is happening overnight standing still rather then whil in motion and the trunk drain plugs are intact so I don't think is coming from underneath...

Heading to the dealer - before that has anyone seen something similar?
 

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2017 CTS-V
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I'd get that to the dealer and cleaned out before mold starts growing. I had the same thing happen to me with my old CTS and I think it is because I accidentally popped the trunk with the remote while I was inside my house and left it open during a rainfall.

The trunks on our cars stay down when they are popped open so it is very difficult to tell whether it is open or closed. Add the fact that the trunk automatically latches when you hit a bump on the road while driving and you'll never even know that the trunk was open in the first place. You either have to catch that it was open before you start driving or you'll know that it was open when you find a puddle of water in your trunk.
 

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2017 CTS-V
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The DIC says trunk open on mine.
I think you've missed my point entirely. Your trunk could be open during a rainfall while the car is parked and you wouldn't know. If you catch that your trunk is open before you start moving, then great...you have a wet trunk and you know why. If you don't pay attention to the DIC and you start driving, the trunk will latch itself when you hit a bump in the road and you'll never even know it was open during a heavy rainfall until you find a puddle in your trunk.
 

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2008 CTS DI RWD FE2
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I think you've missed my point entirely. Your trunk could be open during a rainfall while the car is parked and you wouldn't know. If you catch that your trunk is open before you start moving, then great...you have a wet trunk and you know why. If you don't pay attention to the DIC and you start driving, the trunk will latch itself when you hit a bump in the road and you'll never even know it was open during a heavy rainfall until you find a puddle in your trunk.
+1. That truck latch can be sneaky sometimes. Wouldn't be hard to accidentally hit the button while it's in your pocket and not notice. Then start driving, hit a bump, and it latches shut.

If you do think there is a leak, you could go through a touchless carwash and see if any moisture is getting in. I'd probably try that before going to the dealer. If it doesn't leak with that test, it probably won't leak for the dealer.
 

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2019 CTS
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Go to the dealer and let them find the leak and fix it. Or else we will have another 6 page thread on why CTS trunk latches don't work like a BMW 5-series or my friends brother-in-laws cousin who owns a six year old Honda Accord never had a problem like this. It's wet an water is getting in. I'm sure they'll find it and fix it.
 

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'08 CTS Black Raven/Ebony 3.6DI FE2 6-speed manual
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149 Posts
Discussion Starter #7
Ya was worried bout that (:)stirpot:)). Was hoping someone had a direction to point in to save some grief...

Its repeatable through a brushless car wash so I'll take that as a silver lining...
:bouncy:
 

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Sedan de Ville, CTS
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I have not seen any leaks on American cars in years--unless some body shop played with a car.

Typically, water seeps in around the bolts which need to be insulated with tar, wax, or some such material.
 

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'08 CTS Black Raven/Ebony 3.6DI FE2 6-speed manual
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149 Posts
Discussion Starter #10
Looks like I've answered my own question, based on another posting on amp replacements, I think I found the culprit - can someone confirm what this is supposed to look like?

#1 looks like a drain hose that has come out of #2 - this is the left rear side right beside the amp...

There is definitely water coming out of the tube - bonus points for a trivia question: where exactly does this drain from i.e. where does the other end go after it disappears into the upper rear panel? :hmm:

Incidently, there's a green hose on the right side by the battery which looks like its serving the same function...
 

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Go ahead, blame me. Everybody does 🙄
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I can’t thank you enough! I have been struggling with this for weeks. Thanks again for your help and pictures! ❤
Welcome to the forums!

If you're having water issues in your trunk due to sunroof drains, I recommend reading this thread...https://www.cadillacforums.com/forums/2008-2013-cadillac-cts-general-discussion/724337-stop-soaking-carpet-insanity-forever-ultraview.html

Your front drains probably aren't far behind from creating havoc inside the cabin of your car.
A lengthy read, but we'll worth the time spent.
 

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Thank you so much. My sister and I are in helping my 89 yr. old father that is in Hospice at home here. His 2011 CTS4 was sitting out of the garage because his other one was in the garage. We suspect all the tree debris clogged that drain and pushed it out as to why the trunk was leaking and into the back passenger floor, we will do exactly what you posted.THANK YOU! We have cleaned all the debris from hood,trunk,every little spot on that car now. I may be back with more questions....��. Everyone here is the BEST!!! ❤❤❤
 

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OH LORD....we’ve had a lot of rain lately. The trunk is dry ...BUT, the back passenger floor is flooded. Do you think the hose is clogged? The hose I put back in the boot in the trunk that is....
 

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OH LORD....we’ve had a lot of rain lately. The trunk is dry ...BUT, the back passenger floor is flooded. Do you think the hose is clogged? The hose I put back in the boot in the trunk that is....
Very likely. You need to perform the drain mods outlined in the link I attached.
Any headliner staining?
 

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No, thank goodness...I certainly will reread to a tea your superior link, one more thing... I did hear water in the trunk area where the license plate is attached...UGH
 

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Also a known area of water infiltration on these cars.
The best method to pinpoint the leak is to get in the trunk with a light source and have a second person spray the probable area with a hose.
 
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