I seem to be collecting water in the rear passenger floor and trunk on the passenger side. I have searched and found that the drains can cause water to pool in this spot but we have not have rain in a week and the carpet is still wet to the touch. There is no rust and the previose owner garaged the car so I want to stop this before I get a real problem. The water getting in the trunk is minimal and does come from a small hole drilled in the plastic liner in the well. It is coming in from underneath. I can't figure out how the water is getting in the back but assume it must be engine compartment/sunroof drains. Any other ideas.? It is real odd that we have not had rain in a week and I still have water in the carpet....

Completely dry the car out. Then take a few gallon jugs of water and start pouring them on the car at various places and see what happens. Vents below windshield, sunroof, doors, hood hinge drains, etc.

I've been trying to find my leak. rear driver's side foot well was always flooding. It turns out that the drain under the drivers' side hood hinge was clogged. The drain runs under the plastic wheel well liner. It was clogged and the standing water rusted a hole thru the fire wall. It was a pretty good size hole right next to the parking brake pedal mount. Anyway, rain was draining into this rust hole and making its way back to the rear floor. Strange as the drivers floor never got wet. Water somehow got from the firewall to the rear.

Used lots of that 2 part "steel" putty stuff from Autozone to fill the hole and seal the fire wall. And cleaned out the drain.

That was yesterday's project. I will see how it holds up.

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1987 300TDT
1981 VW MKI Caddy 1.6 diesel, waiting on engine swap
1983 D-50 Power Ram 4x4 "Mitsubishi" 2.3 turbo diesel
assorted gas powered crap and motorcycles

RIP: 1984 300TDT, 1982 300TDT, 1984 190D 2.2, 1992 300D 2.5, 1987 300TDT, 1982 Maxima LD28, 1983 Maxima LD28, Isuzu C223 P'ups X3, 1983 Holiday Rambler 6.2 Banks turbo diesel, 1984 Winnebago LeSharo 2.1 TD, 1985 Allegro 6.5

Mine was coming from faulty condensate drain situation under the dash near firewall. Foam tube wears out, and condensation drippage will flood car, and fairly quickly.
JL

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Jimmy L.
'05 Acura TL 6MT
2001 ML430 My Spare

Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John