Coolant flowing off back of belly plate.

[blktoptrvl]

137K

I got home a little after I got the "Low Coolant Level" message. I watched and the temperature gauge never moved.

But there were steam vapors coming from somewhere. So, I let the car cool and then removed the overflow cap - the tank was empty. There was no sign of water on the floor.

So, I refilled at the overflow tank - it took about a gallon of water. I was starting to wonder where all this water could be going when I started hearing it hit the floor. Looking under, I could see that the water was flowing off the rear end of the aluminum stiffening belly plate.

I could also see a little wetness on the plastic plate under the radiator. So thinking it might be a cracked radiator, I pulled the fan so I could see better and started pouring water again - it does not seem to be the radiator.

Going to my Bentley paperweight I could find no coolant routing diagram.

So, my questions are: does anyone have a routing diagram that shows where all the hoses are?

Does anyone have experience with water pouring out the back of the engine when the overflow tank is filled?

Of course I am hoping there are hoses I am not seeing and it is not the valley pan, but I'd appreciate any suggestions.

Edit:

So far, this seems to be the best tread related to what I am experiencing...
https://xoutpost.com/bmw-sav-forums/...lant-leak.html