found a bunch of water yesterday, behind driver's seat. Clean it all up, not sure if someone spilled their cup of ice water or whatever.

Today drove approx 75 miles, with air and water again !!!!!!

My first thoughts are the drainage line from the AC to the outside is plugged.

Just bought this car the end of April and not used the AC that much.

So, where is the drainage line?

Bob
1981 240D 176,000 miles,

Actually, the A/C drainage line tends to disintegrate. It is just a foam tube that runs from the very center of the dash to and through a hole in the peak of the transmission hump under the dash. When its gone your A/C condensation drips down onto the floorboard.

Ken 300D

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1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles

The 240D should be similar, but on my coupe, there is also a small rubber drain line together with the high & low side lines that come through the fire wall below the battery. Paul.

__________________
1984 300CD red/blk 290,000 partial resto
1980 240D 4 sp Brn/palomino gone
1997 Mazda Miata STO edition wife's baby
1988 Lincoln Mark VII LSC next resto
1986 Subaru GL wagon daily
1993 Isuzu pickup field beater
2008 Honda Civic EX-L 5sp wife's new car
1978 Honda XL350
1974 Honda XL70 my Calif. ride in HS

so what is one to do? can a replace line of some sort be added? or will clearing the line around the battary stop all this water on the floor?


bob 240D

I have not had to replace any so far. I understand you can use a different material that will last. It's probably not easy to do given the location.

Try the search feature here - I know I have read about this several times in the past.

Ken300D

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1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles

Bob
I think your windshield seal is kaput. Try parking on an incline next time it rains, with the nose of the car pointing downhill. You should get a pool in the driver/passenger floors up front. If I'm correct, and I may not be, but if I am- your water is coming in from the windshield seal, and flowing back into the rear floor area, especially when you drive.
Other suspects are the sunroof drains, and the hood hinge drains in the engine compartment. Make sure they're all clear.
I don't know if the AC could make enough condensate to pool up in the rear floor area.

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'02 BMW 325i
'85 300D 450k
'93 190E 2.6 170k(killed by tree)
'08 Ducati Hypermotard 1100S 6k
'06 Ducati S2R800 14k(sold)

The a/c can make enough condensate to pool in the back. I had that problem on one that the drain line was disintegrated on. Remove the kick panels as required and look at the area closest to the firewall directly behind the ash tray area. Do you see a foam looking hose approximately 1" in dia. If you don't then that is probably your problem. Cut the top 1/4 of a plastic quart oil bottle. Fanagle that top 1/4 section into place where the part where the cap screws on sticks down into the hole and the large part of the bottle is over the discharge nozzle of the evap box. If this was causing the wet rear floor issue then it will stop after performing this modification.

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Jim

Pay particular attention to my very expensive repair in post #7 of the thread below. Miss that old wagon.......


I've sprung a leak, evaporator drain hose...

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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

By remarkable coincidence, I started noticing a dark footprint in my driver's side carpet mat. Not the lower carpet, but the cover mat. I thought I had stepped in some oil and left a mark, but I found the mark changed when I changed shoes. When I touched the carpet it was soaked.

So, I removed all the carpet mats and the next day saw the water running down from the center hump - on a hot dry day with the A/C on. This is an obvious indication that the evaporator drain has gone bad.

The drain is a foam tube with a very thin sheet of plastic around it, held by a tie wrap. That's what I found anyway, and I'm not sure that is the stock configuration. The foam was crumbling and the plastic sheet was ruptured - maybe a mouse?

Jim's suggestion sounded good, and I used a 1/2-liter water bottle top. Wedged it right into place and now the evaporator drains perfectly. I just can't understand why MB would engineer these crazy foam tubes here and in the ACC sensor!

Ken300D

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1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles

Is there much about the MB AC systems that makes much sense??????

__________________
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

found and replaced the drain and replaced with a plastic bottle fix.

But, my probem still exists. right now I have no mats in the rear right side. The water seems to come out where the heating vent under the driver's side. I pushed up the drain plug a flexable wire, and no junk came out. also did this to the drain under the battery. junk came out, but sill have water under the driver's seat. not as much, but sure is a messy thing for MB.

bob 1981 240d