The attached pic is of my OM606 - but I'm assuming it is the same for you. The block heater should be located in one of the freeze plug holes on the passenger side of the engine. As you can see in the pic, mine is to the rear of the engine block drain - below the exhaust manifold. When I bought mine the cord was not installed, there was a screw-on plastic cap on the block heater threads. I just removed that and screwed on the cord (aftermarket cords are plug-ins I think), then route the cord and zip tie it out of the way.
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'95 E300D ("Tank") - 231,000 miles
'79 240D ("Biscuit") - 197,250 miles (Sold)
'83 240D ("Ding-Ding") - 217,000 miles (Death by deer)
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"Back off, man. I’m a scientist” ~ Peter Venkman
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