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Old 04-13-2009, 02:39 AM   #1
Stivie
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Member#: 162845
Join Date: Oct 2007
Chapter/Region: NWIC
Location: Pacific Northwest
Vehicle:
2007 Audi RS4
2008 CBR 1000rr

Default How To: Diagnose and Fix your Trunk Leak

As far as I know, this thread only applies to 02-07 Impreza Sedans

Ok, so i have spent the last two months trying to fix my trunk leak, and it's still not even fully fixed. But, I did search on here to try and find answers, and there was NO information that helped. So, I wanted to make a thread that will pop up when people search and hopefully help those who are in the same situation as me.

Throughout my journey, I have figured out that there our trunks have 3 main sources for water leaks.

Diagnosis: First of all, it's important to figure out where the water is coming in, so have someone get in the trunk, close it, and turn the hose on. You can also use other proven methods, but this is helpful to figure out which of the three main causes it is.

1. Trunk Seal (Weather Stripping)

This is the NUMBER ONE most common cause for Impreza trunk leaks.


The seal compresses over time and eventually lets some water between the underside of the trunk and itself. If this is happening, it's time for a new seal.

Another possibility, which ended up being my problem, is that water is making it under the seal, in which case it needs to be removed, cleaned, rubber sealant applied where the old stuff used to be, and replaced. I'm in the process of doing this right now. So far, it seems to be fixing the problem

2. Tail lights

If there is water in either of the rear corners of the car, and nothing is visibly coming in when you squirt water on the trunk, it's possible that the tail light seals are leaking. If they are, you will be able to see/feel the moisture in the foam (which is accessed by removing the trunk carpet guarding the rear quarter panels). It will also be fairly obvious as there would be water right at the base of the tail lights. To fix this, remove the tail lights, add some sealant, and replace. I did this as a precaution and it's really easy.

3. Wing Holes

Ok, no brainer, I know..but you would be so surprised how much water can get in through those holes, even with all the screws on tight. One of the nuts holding my wing on was a little loose, and it was like a faucet when I put the hose near the wing. This one's fairly easy to diagnose and fix, but i thought i would include it anyways, since it has happened to me more than once!

Other possibilities:
-Rear glass seal (can be ruptured by subs or other hard vibrations) [not sure how this water would make it into the trunk, but i was told this buy an auto-glass shop]
-Plugged drain holes for Pressure regulation flap in fender (can be covered with dirt and stuff causing water to build up inside the rear quarter panel)

Hope all of this has helped and if anyone has anymore useful info, please don't hesitate to add to what I have said!
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Last edited by Stivie; 04-13-2009 at 02:44 AM.
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Old 02-29-2012, 01:25 PM   #2
DeM3n
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Member#: 184692
Join Date: Jul 2008
Chapter/Region: NWIC
Location: Scio, Oregon
Vehicle:
2004 STI
WRB

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Just wanted to say thanks. This helped resolve my issue.
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Old 02-29-2012, 02:25 PM   #3
bako
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Join Date: Oct 2009
Location: Europe
Vehicle:
2002 impreza WRX JDM
blue

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ok, I have water in the tail light (left one) I have replaced the seal, it was leaking. I have added rubber sealant on both side of the foam seal, but still doesn't help. after every rain, or car wash I get up to 0.3 liters of water.
I see no leak when I open the truck and look at the inside part of the taillight and on it;s bulb housings. I do not know what to do!!!
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Old 06-25-2012, 04:33 PM   #4
blaze wrx
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Join Date: Mar 2010
Location: WV
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02 WRX
blaze yellow

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For me, it was the crappy rubber/plastic gasket thing that goes on the back (inside the trunk, exterior of light housing) of the tail light. I had extras because it seems like someone hits my car once a year so I'm always buying tail lights.
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Old 07-07-2012, 10:46 AM   #5
Shocky
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Member#: 315938
Join Date: Apr 2012
Chapter/Region: MAIC
Location: Hummelstown, PA
Vehicle:
1999 RSTi
Black

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I replaced my trunk seals like shown in the first picture and it resolved the leak needless to say.
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Old 08-26-2019, 04:54 PM   #6
NewShockerGuy
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Member#: 40736
Join Date: Jul 2003
Chapter/Region: MAIC
Location: Pittsburgh, PA / FairFax, VA
Vehicle:
2005 WRX STI
Aspen White

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So I am getting water in my trunk.

I checked everything and it wasn't until I REALLY washed the car with a ton of water that I see water is coming from this location. What would cause water to come in from this exact location? I replaced the trunk seal but that isn't the problem. Water is coming in from these two piece of metal. Appears to be on both sides.





How is water coming through this?

-Nigel
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Old 08-26-2019, 10:10 PM   #7
some dude
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Member#: 100300
Join Date: Nov 2005
Chapter/Region: MWSOC
Location: MIC|-|IG/\N
Vehicle:
06 WRX
CGM

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My 2006 was leaking, turns out right where bottom right of rear glass meets trunk pinch point at top right. Just underneath where trunk lid covers top right corner when closed.
I put some liquid nail clear sealant in there just under trunk lid and it completely stopped the leak. Car washes and hard rain, not a drop in trunk now. So happy!
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Old 08-27-2019, 10:39 AM   #8
domin8469
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Member#: 505492
Join Date: Aug 2019
Location: Phoenix, AZ
Vehicle:
2006 WRX Limited
Dark Grey Metallic

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The wing on my car was put on crappy so I redid the bolts and did the holes a bit bigger so I could actually put them in and now it doesn't leak like it had just a small bit of water which due to the way the kid who owned my car put the sti wing on cant be avoided a new trunk lid is the only answer. I can live with the tiny amount of water I get now.
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