Here is a hint I have used on some cars. Disconnect the upper radiator hose from the radiator side and pour water or coolant in the end of the hose. On some cars the water doesn't get into the block until the water is hot and the thermostat opens so this method puts water on the other side of the thermostat so it gets into the block and head of the engine. I had to do it this way on my car.

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1983 300SD
200000miles