Wet pass floor - yes I searched - Chevy Impala SS Forum
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post #1 of 12 (permalink) Old 07-27-2017, 02:14 PM Thread Starter
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Exclamation Wet pass floor - yes I searched

Opened the car door this am and was nearly knocked over by the smell of wet/mold/bleh. Turns out the front pass floor is soaked. 100% sure its water, too. Not slippery and no coolant smell. Carpet was drenched around the footwell near where the AC drains out through the firewall, but the foam around that nipple was (and is) dry. 90-degree elbow was there in the engine compartment. Nothing blocking it. Padding under carpet is soaked on the passenger side, as is the pad in the footwell. Pulled it all out to dry. Was wettest around the center, center-right of the firewall pad - the rubber stuff - and the footbox itself, which lends validity to the drain being the culprit. Pulled the drain pan off (PITA) and it looks ok. No cracks and the hole was clear to drain. Looks like someone was in there at one point and used silicone sealant along the edge to seal it up.

I know everything is pointing to the condensate drain being the source of my water, but there was nothing blocking it - so I am stumped.

Pulled the cowl covers and cleaned out the cowl. Dumped a bunch of water in there and watched for leaks - nada. Dumped water on the windshield - no leaks. Inspected the firewall and floorpans in the engine compartment and under the car - no rust or holes. Its tight as a drum under there.

Any ideas ladies and gents? I am going to seal it all back up and pop it in - hoping for the best, but it doesn't make me sleep any better not finding any obvious cause of the water.


1995 Caprice ERE 383, CIA long tubes, Dynomax VT's, RAISS, Kore3/Z06 brakes, 3.42 posi, Boss 338 20's, 12 way seats, Impala SS console, etc etc etc
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post #2 of 12 (permalink) Old 07-27-2017, 04:34 PM
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It appears you're dealing with a wagon, so I'm sure you've traded notes on usual leakers with fellow longroofers. Sedans have their own collection of places that corrode and fill up the footwells. Good at least to hear it's limited to one side. Also, sure you heard the trouble running heavy A/C (especially at speed) if the drain elbow and downtube is missing and condensate wicking back inside. Your description sounds like more than just a single day in high heat though. If it rained real hard, - and you were parked downhill, - and the rear roof-to-door leaks, or fenderwell rotted out, then water can run from rear to front. I had a ghost leak in an '80 Riviera turned out to be a long section of urethane broke loose from the bottom of the windshield. A spray hose never showed it. But I noticed the windshield moved one day when closing the door! Had it reinstalled and no more leak.

\'96SS SOB: SSRI, Herter Tune, Tri-Y II, , 3000 Edge, F/HO bars, METCO extendeds with CV MMC, Bilsteins, currently Vredestein Ultrac Sessanta (315/35 rear). Finally, wait for it... LT-4 knock module!
\'96FWB BUW-Butt Ugly White: PCMPerformance tune, HDFA w/ swissed filter, 1/2 SLP s.s. catback with H- and Flow Super 50s, oem opti rebuilt 3 times, SS Bars, METCO LCA, Airlift 1000, Monroe SS, PowerTrax No-Slip, CTS wheels with +1 rubber. Finally, yes again... LT-4 knock module!

Last edited by 96 Black; 07-28-2017 at 10:56 AM.
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post #3 of 12 (permalink) Old 07-27-2017, 05:19 PM
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Check the antenna grommet. It is behind the wheelhouse on the passenger's side. It is just below the cowl drain. I also had a window unseal along the bottom edge It was a real PITA.


I painted a 1/2 inch line on the floor around the edge of the footwell, with water soluble paint. If any water gets in, it will wash the paint away in that area.

1991 OCC 461 (.030 over 454) BBC, 3.23 posi, flash to pass, drop spindles & springs, Impala rims, Hydroboost, Recaros, MOMO/wood SW w/QR, custom wood shift knob, Pioneer DEH P77DH
1992 OCC now with 5.7 tbi, DEH P77DH
For a parts list, check https://www.impalassforum.com/vBulle...ion-parts.html
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post #4 of 12 (permalink) Old 07-27-2017, 09:38 PM
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Since you have the carpet out, have someone run a hose around the exterior of the car while you're inside checking for any trails of water. Have them start low and work their way up, paying particular attention to the area around the cowl, window seals, and roof rack. If no leaks, then it's likely your AC tray.

Mike - '94 BBB SS (RIP 06/16) - '95 DGGM SS - '96 DCM SS - '92 BBB Wagon
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post #5 of 12 (permalink) Old 07-28-2017, 08:42 PM
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Some people had a problem with water dripping out of the AC condensate drain and then entering the passenger compartment through a body seam. I put a drain hose on my condensate drain so I would never have to worry about it.

1994 Roadmaster Wagon.
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post #6 of 12 (permalink) Old 07-30-2017, 06:18 AM Thread Starter
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Thanks for the suggestions. I've investigated them all - including having a hose moved around the car while I watch for leaks inside. No dice. Here's hoping it was the AC pan.


1995 Caprice ERE 383, CIA long tubes, Dynomax VT's, RAISS, Kore3/Z06 brakes, 3.42 posi, Boss 338 20's, 12 way seats, Impala SS console, etc etc etc
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post #7 of 12 (permalink) Old 07-30-2017, 10:57 AM
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Another way to check for leaks is to put a shop vac in the cargo bay, and run the suction hose and cord out of the vent window. Seal the intake for the AC (under the cowl), window, hose, and cord. Put the windows up, turn the vacuum on, and put kid's bubble liquid, or slightly diluted dish washing liquid on any place/area that might leak. Bubbles should lead you to the source.


There are two sizes of drip pans, so if yours is cracked, make sure you get the right one. I found one on a buick that was longer (front to back) than the one in my OCC.

1991 OCC 461 (.030 over 454) BBC, 3.23 posi, flash to pass, drop spindles & springs, Impala rims, Hydroboost, Recaros, MOMO/wood SW w/QR, custom wood shift knob, Pioneer DEH P77DH
1992 OCC now with 5.7 tbi, DEH P77DH
For a parts list, check https://www.impalassforum.com/vBulle...ion-parts.html
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post #8 of 12 (permalink) Old 08-03-2017, 12:54 PM
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Most likely is the AC Drain line is plugged causing it to go into the interior. Hard to diagnose easily. but if you turn on your AC and it doesn't drip outside...

Can also be rust around the windshield causing it to leak... Requires removing windshield, repairing rust and reinstalling windshield.

Sunroof? It has drains that can become clogged or disconnected causing interior "flooding".

Those are the main culprits I am aware of.

Rodney
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post #9 of 12 (permalink) Old 08-03-2017, 06:10 PM
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Should the sunroof leak, it will drain down the B or C pillar. There is little chance that it will end up on the floor, especially the front.

1991 OCC 461 (.030 over 454) BBC, 3.23 posi, flash to pass, drop spindles & springs, Impala rims, Hydroboost, Recaros, MOMO/wood SW w/QR, custom wood shift knob, Pioneer DEH P77DH
1992 OCC now with 5.7 tbi, DEH P77DH
For a parts list, check https://www.impalassforum.com/vBulle...ion-parts.html
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post #10 of 12 (permalink) Old 08-04-2017, 11:13 AM
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Yo Fred,
I recently went through my 'Astroroof' for several issues. To re-upholster the lid, try to reduce wind noise, attend to leaking on the pass. seat through the carwarsh... While in there I ran a fishtape down all the tubes and I recall them being the A and (either B or C pillars), but unimportant which as they're easy to scope out and clear with the headliner down. All my drains were clean, but if Mr. -dan has one it would be worth checking as it can certainly leak down forward of the backseat if so inclined.

My 'leaking' (and the wind noise) was/is simply the gasket (thin felt U-band glued to the glass frame) wearing down enough over the years that it'll never give good seal. With a hose I can see water going in, but not normally any leaks. The carwash is just too much for the the tubes to carry away hence the overflow over the capture channels.

\'96SS SOB: SSRI, Herter Tune, Tri-Y II, , 3000 Edge, F/HO bars, METCO extendeds with CV MMC, Bilsteins, currently Vredestein Ultrac Sessanta (315/35 rear). Finally, wait for it... LT-4 knock module!
\'96FWB BUW-Butt Ugly White: PCMPerformance tune, HDFA w/ swissed filter, 1/2 SLP s.s. catback with H- and Flow Super 50s, oem opti rebuilt 3 times, SS Bars, METCO LCA, Airlift 1000, Monroe SS, PowerTrax No-Slip, CTS wheels with +1 rubber. Finally, yes again... LT-4 knock module!
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