In my case,t he car had hardly any fluid left in int after the radiator broke.. and I did a flush my way, I ran water through until all the green stuff was gone...
I refilled from the raditor top hose to make it easier and used the expansion tank.
'92 300CE - Sold
2004 C240 - C7 Wheels
2015 ML350 - P1, Pano, Ash poplar wood, Sport Dinamica interior, Running Boards Keyless go.