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Best I can tell, TIS for the N20 says to take off both pump hose and radiator hose to drain (with cap off the reservoir 'ball'). For the N55 in a 235 it says to remove both hoses from the pump. The refill procedure uses vacuume valve on expansion tank (bring pressure to -0.7 to -0.95 bar and then open valve to suck the coolant in). The video shows over 14L in the fill tank it is pulling from, but then looks like they only end up adding a couple (not sure if it is vid of full fill, or just to demo the valve).
Here's the volume listing:
17 00 Coolant, Cooling System Test F87 / N55
Model series F87
Model designation M2
Coolant quantity on vehicles with manual gearbox 10,5 l
Coolant quantity for vehicles with DKG 10,5 l
Top-up quantity of coolant in the event of repair with disconnected coolant hoses. Observe the mixture ratio and filling level! 2,0 l
Test pressure for cooling system excess pressure (in bar) 1,5
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