2001 e320 55k
trans slips, remove top radiator hose, trans oil in water that was leak out top, MERCEDES SHOP replace radiator, drain trans oil, no more slip of trans, oil goes to top of water or you see it will be at top of your small exp water tank.

REPLACE THE T-SAT , MAY STICK CLOSE IF WATER IS DRAIN OUT FOR
REPAIR, ENGINE WILL BE VERY HOT IF NOT OPEN T-SAT AND MAYBE NEW ENGINE ALSO TOP AND BOTTON HOSES