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Old 04-16-2002, 08:39 AM
Registered User
Join Date: Jan 2002
Location: Hurley, New York
Posts: 39
water under floor mat passenger side only

I noticed under the floor mat on the passenger side that I had water under the mat. It was a lot of water, and the thick black insulation pad is saturated. I removed the floor mat, and removed the pad to dry it up. I know it's not coolant. The water is crystal clear. The car is under a cotton cover all winter long, and it was dry before storage I check these things out before storage. I have not washed it yet this spring. The defroster/heater was run a few days this winter when I drove it for a few short distance runs. Any ideas where the water might be coming from?

Thanks !!!!!
1981 280SL Euro 107
1978 VW Convertible
1984 280SE Euro
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Old 04-16-2002, 09:26 AM
Join Date: Jul 2001
Location: Old Lyme, Connecticut
Posts: 3,596

The most likely source of water is rain or melting snow, that would normally drain off the car through the drains near the hood hinges. These drains can be plugged with things like rodent nests, acorn shells, leaves, pine needles and so on. I did not see what model MB you have, but they all seem to have a drain under the hinge pocket, and the flow of draining water off the roof, windshield and hood (when the car is moving) can cause the debris on these surfaces to get washed to this area. Open the hood to the vertical positon and inspect for debris, or if the car was sitting for a while, nests from rodents and the like. Clean it out and run water in the area to see if the drain is clogged. If it is you can run a stiff wire, like a hanger, through the rubber grommet to clean it out.

If you have a sunroof there are drains in the A pillars and C pillars that can get clogged from having the roof open under trees and having debris fall in. The A pillar drains can be seen by looking in front and outboard of the sunroof openning, and these can be cleared with either compressed air or some kind of stiff wire. Good luck, Jim
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)
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Old 04-16-2002, 10:30 AM
pmizell's Avatar
Benz Zealot
Join Date: Jun 2001
Location: Houston, Texas
Posts: 838

You may have a leaking evaporator hose like me. Your defroster would engage the AC and would produce condensation in the heater box inside the dash.

It's worth a check. See the following post:

Leaking evaporator drain hose...


'91 300E, 210k miles
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Old 04-16-2002, 11:41 AM
thebern's Avatar
Registered User
Join Date: Jan 2002
Location: Knotts Island, NC
Posts: 382
water leaks

Use the search feature and check my other posts on this topic. What year and model is your car?
1982 240D 313,000 (4 speed)
1984 300CD 172,483
1985 German Shepherd Dog -Lacey- R.I.P.11/04/05

Hood Stars, Wrist Crowns and Obsession Dobs
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Old 04-16-2002, 11:17 PM
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Join Date: Apr 2000
Location: San Antonio, TX
Posts: 387
We had a similar problem in our 300E (w124). It was a missing rubber plug...
Bill Streep
San Antonio
'57 190SL (toy)
'08 S5500 (mine)
'09 CLK550 (wife's)
'06 SLK350 (daughter's)
'11 GLK350 (daughter's)
'03 CLK310 (spare)
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Old 04-18-2002, 07:37 AM
Registered User
Join Date: Jan 2002
Location: Hurley, New York
Posts: 39
I think I created another problem?

I found a rubber plug, about 1" in diameter under the black floor insulation on the drivers side when looking for my water source.

I can't locate the water source yet. I tried to remove this plug to get a look inside, and it fell into the flooring which is about 2 " deep. I tried, but with no success to get the plug back out it just rolled out of reach. I ran the car, did not run the AC/DEF last night, and the floor remained dry. I hope I can replace the plug, does anyone know what that plug is for. While driving, I put my hand over the hole, felt warm air out of it. Do I need to be concerned ?

I'll look further into the water issue this weekend. I think it's AC related.

Sorry I did not post model/yr it's a 1981 280sl euro model. I've kept the car dry all winter and spring too. This should help determine where the water is coming from.

Thanks for the advise.
1981 280SL Euro 107
1978 VW Convertible
1984 280SE Euro
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Old 04-19-2002, 03:57 PM
Registered User
Join Date: Apr 2002
Location: San Jose, Costa Rica.
Posts: 50
I had the same problem not to long ago, and after going nut taking the interior apart, covering holes I took the console apart and ran the ac, I found a steady trickle of water coming from the condensator housing, all I had to do is reatach the little hose and presto, done deal.

87 300E
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