I am planning to replace the leaking water pump on my 1985 300TD w123. Can I get away with just draining the coolant from the radiator plug? Or do I also need to drain from the block (would like to avoid? this if possible as I have read it is not easy to get to) Sorry if this is an obvious question.

Thanks!

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1985 Mercedes W123 300TD euro Wagon 195k - new Daily Driver

1982 Mercedes W123 300D Turbo Diesel 259k - sold

1977 Mercedes W123 300D Diesel 111k - "Rayzer" - sold