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I would do the radiator drain. I feel the info is correct about most dealers actually just replacing the coolant, not actually "flushing" the system with water.
OK, radiator drain, you can get from the hole in the bumper, use a needle nose pliers, and also a small slip-joint pliers may come in handy as different angles are needed. Need to rotate 1/4 turn ccw and pull out. It doesn't open up as well as the other MB vehicles, a bit slow, but yeah this is do-able and getts more fluid out than the lower radiator hose does. Be sure to loosen and drain at the BLOCK too.
Gilly
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