I have the same issue as my hatch is rusting out and most of the guys I know have this isssue. There are 2 things i suspect but cant seem to fix. If you pull the rear window glass lower seal off there are clips that might allow water to build up around them and seep in. Now this being said its because the seal no longer stops the water from going in and it just allows it to collect by these through plastic clips.
I decided to silicone around them in hopes that this would solve the issue as well as silicone around the base of the spoiler. To no evail. If I let the car sit level when it rains the water builds up inside the rear plastic cover and rusts the wiper motor. lift the trunk lid and it all pours out into the drains and some into the rear carpet. I dont have water building up in the trunk but I know with no rear plastic it would. My rear hatch seam is going to rust out shortly and I can only think to replace it and find the problem then. No idea. I contimplate filling the replacement with foam. This would also be a reason to get a fiberglass one or carbon fiber. Not because it will help with weight at all but it wont rust out.
I've got this problem as well :S. if i open the boot a small waterfall soaks what was the boot. Luckily for me its all stripped so I have little need to open it and i can wipe it up as its falling on bear metal. Although it would be nice not to have a small lake mulling around :S.
had the same issue.
the rear wiper engine got rusted pretty bad also.
Now, I've removed the wiper assembly + the spoiler, and filled the holles.
didn't took the car out to see what if the water is still there as my car is under knife and also it snowing
now, from these holes to the back of the hatch, I suspect the water movement and because there isnt any drain area there, here it comes rust.
I'm thinking that a rear fiber glass hatch will solve this
'99 Front Bumper, Philips HID's, Infinity Kappa 693.7I & Kappa Perfect 6.1 & Kappa Perfect 12VQ, Dietz Power Cap 1F, Pioneer HU, 2x Kenwood Amplifiers
Apexi AVC-R, K&N AirFilter, Supra pump hotwired, Tein Flex Coilover Suspension Kit, .... more to come
....and yes BORLA, is romanian.
bringing this back... have the same issue. Did ANYONE find out where it could be comming from?
Ill take this as like a new thread... Did you check your plugs under the hatch? This was my problem, unfortunately I was given no warning until I went to work one morning after a stormy night, and discovering 2-3 inches of water sitting in my floorboard. This is a lot of times the problem. Probe the plugs with something straight, then shoot a water hose down all the plugs. Let me know how this works.
Water in the back seats could be sunroof seal or the two electrical plugs.
Water in the lower hatch/tray/wiper motor cover could be.
Hatchglass seal, in particular lower/side/corner/garnish area (water runs from there on mine)
Hatch anti-rattle stop blocks. (these seem to act like a dam and water gets deep enough to seep in at window corner seal)
When life throws you a curve......Drive Baby, Drive.
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