Folks, another question. I don't really want to mess with removing the engine plug and draining the coolant from there, as I have heard of them popping out unexpectedly afterward and then you have a REAL problem. So, I guess the technique (on the 1983 300D) would be to remove the thermostat, then could I just flush water through the upper radiator hose, open the drain on the radiator, or remove the lower radiator hose, and perform the various flushes and rinses that way? I believe that this engine doesn't have a coolant bleed screw, so just as long as I attempted to fill the upper radiator hose to the best of my ability, and loosened the cap on my coolant recovery tank, would this work?
Thanks again for your help and advice!

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1983 300D (Hans)