C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Floorboard leak..

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Old May 15, 2008 | 02:56 PM
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Default Floorboard leak..

I've already visited the other threads on this, even one I posted myself.

The drain tubs that run from the water collection area near the windshield area don't seem to be clogged. I pour water into them and they drain below the car about even with the A-pilar. IF they are clogged, how in the heck do you get them out?

I have removed the seat, carpet, and padding in the passnger's side. I hosed the windshield, sprayed underneight the car, etc.

No water comes inside the car.

Any ideas?

When it rains, my floorboards, particularly the passenger's side get soaked. The passnger's side doesn't drip at all, all the weatherstriping looks as good as new. Also the "gunwale" as ill call it isn't wet (where the speaker covers and carpet cover the side frame of the car). It is literally only the floorboard that gets wet.
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Old May 15, 2008 | 03:44 PM
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Only when it rains?

Sounds like a heater core issue.
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Old May 15, 2008 | 03:55 PM
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Yes, only when it rains or I go through a car wash (rarely). When I say floorboard, I mean only the part that is parallel to the ground. The side walls of the passnger's compartment are dry (speaker cover door/sill area, hump where the transmission is, the foot rest where the floorboard starts to go up at an angle under the dash).

What would be other symptoms on a heater core? I had one go out on my first car when I was 16. Looked like the AC vents would blow a mist.

Last edited by CStewTAMU; May 15, 2008 at 03:57 PM.
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Old May 16, 2008 | 09:21 AM
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ttt
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Old May 16, 2008 | 12:35 PM
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If the core were leaking you would smell it and the coolant level would go down. Have you tried placing a napkin around in areas water could come from? I suggest this because water could run down say the inside of the sill which is rubber backed or a different part that is painted and it would be VERY tough to tell water had been there. The napkin would get soaked showing water had been there.

With no water appearing from the bottom my first thought is water running down the leading edge of the window then down by the sill area.
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Old May 16, 2008 | 01:06 PM
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What baffles me is the sill area is dry as a bone. I think I am gonna take it through a drivethrough was with all the carpet, seat, padding, etc out and see where water comes in. I don't know what else to do.
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Old May 16, 2008 | 03:01 PM
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Did you post this awhile back and we talked about looking for a puncture hole in the floorpan near a front jack point?
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Old May 16, 2008 | 05:57 PM
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http://mysite.verizon.net/brianjbalo...draintubes.pdf
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Old May 16, 2008 | 08:52 PM
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I bet its that blower plenum one. Do I have to take anything apart? Like take the side grill off? Your link says I can reach under the car, but I am not having any luck with that.
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Old May 16, 2008 | 11:35 PM
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Thanks, ynk. The blower pledum was completely clogged. We'll see next time it rains if it leaks. I bet that was it. there was no draining out of that hose before I cleaned it out. I did have to take the side "gills" off to get to it.
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Old May 17, 2008 | 02:08 PM
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Originally Posted by CStewTAMU
Thanks, ynk. The blower pledum was completely clogged. We'll see next time it rains if it leaks. I bet that was it. there was no draining out of that hose before I cleaned it out. I did have to take the side "gills" off to get to it.
Glad I could help. Since that one was clogged, I would check all the rest too.
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Old Aug 24, 2009 | 09:11 PM
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ynk Thank you, you've also helped me out with your info. Couldn't find the drain hoses in FSM, anyone know where they are?
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Old Aug 24, 2009 | 10:19 PM
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You can also have water leak past the hood seal into the Evap box. Alot of times the sealant for the hood seal gets dried up and allows water past it. If it is dried up and letting water into the engine bay, I'd go ahead and pull the hood seal, clean up all the old goop up, reinstall it, and then reseal it with some Urethane sealer or something. Some people have also had leaks on the driver side where water gets past the hood seal, runs down some wires that go into the firewall.

What I would also do, is pull the kick panels if you haven't. Run water all in the cowl, get a flash light and look inside at the firewall to make sure you don't have any water leaking down the firewall and behind the carpet. I had a few I had to fix.
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