I knew it was leaking and have checked all the likely candidate, water pump, water pump o-ring, the drain valve on the block and the head gasket.

I have a very slow drip that comes off of the passenger side front bolt of the transmission bolt. There is a oil cooling line just above it, but why the feck would coolant be leaking from that? I cannot find any leaks from the motor other than motor oil from the front timing cover.

I like this car but I am pretty frustrated with this one. It looks and runs great and it doesn't overheat but it is losing coolant and if I took it on a an extended trip I think it would eventually get low enough to be a concern. Just trying to make it right or at least better.

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1981 300TD
2005 C55
2004 E500
1999 ML430
1992 400E
1998 C43
2001 SL500
1988 300SEL
1986 190E 16V
1991 190E 2.6

This is just a thought, but there is a freeze plug on the back of the motor. I saw a post from another member, he had a leak from that freeze plug. Take a look, I dont remember what car or year.

Thanks, checked that. There is no sign of coolant leaking other than right back under the trans pan. Nothing on the lock or the bell housing.

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1981 300TD
2005 C55
2004 E500
1999 ML430
1992 400E
1998 C43
2001 SL500
1988 300SEL
1986 190E 16V
1991 190E 2.6

If the transmission cooler line in the radiator corroded through, you may have coolant in your ATF, and ATF in your cooling system.

Not good for either of them, but you should be able to see what's going on relatively easily by pulling the tranny dipstick and looking at the level and color of fluid on it.

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-Josh
Testing the cheap Mercedes axiom, one bolt at a time...

Already checked, no comingling of fluids, the leak is straight coolant.

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1981 300TD
2005 C55
2004 E500
1999 ML430
1992 400E
1998 C43
2001 SL500
1988 300SEL
1986 190E 16V
1991 190E 2.6

This may be a stretch, but I have a 1995 SL500 and I was leaking a "slimy green" fluid that looked like congealed antifreeze and it was being discharged from a hose that extended down from the floor pan above the center of my transmission (in the trans/drive shaft tunnel). This hose enters into the compartment that houses the heater core and the air conditioner evaporator on my vehicle. Not sure how yours is set up. I found that my heater core was leaking and the discharge dripped down over the transmission onto the floor. I ran block sealant into the heater core I( I had disconnected the hoses from the block and ran the mixture directly into the heater core) and so far it hasn't dripped anymore. The alternative according to the dealer, is a faulty evaporator and the "green slime" was likely a dye that was placed into the system by the prior owner of this car. Hope this helps. Steve

Steve, that makes the most sense. I live in Phoenix so heat not used a whole bunch but I was thinking about the heating core yesterday and ran the heat for a bit in the morning with the thought that it may indeed be the problem. I did hear fluid "gurgling" behind the dash on the passenger side as the heat was on and don't recall hearing that on other Mercedes I have had. Thanks for the insight.

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1981 300TD
2005 C55
2004 E500
1999 ML430
1992 400E
1998 C43
2001 SL500
1988 300SEL
1986 190E 16V
1991 190E 2.6

That's what I thought when I first read the problem. I would agree with that, either a heater core leak which is running out the evap drains, or also check out the heater valve, over near the battery, that could also drip down on the trans.

Gilly

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