OK, I found the block drain, finally. On the passenger side, around the area under the air filter. Gonna put in an order for a new t-stat and when that gets here, then I will flush.

Here is a link with some pictures:

http://www.peachparts.com/Wikka/OM617BlockDrainPlug

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1991 300E 124.030 103.983KE 722358 03 412178
207K

1979 240D 123.123 250K (Project car)

2000 Ford Ranger, 187K

2015 Dodge Ram 1500 EcoDiesel 37K