i cant really see is it fan or w pump,but if any of them damaged,i wouldnt drive at all .if its water pump ,so u will be in real trouble,no drive at all.if its fan only,u can remove it and heater on full go inside car and u might get it on the road but check your temperatures ,not sure if M44 can go without viscous fan .
dont need any fancy thermostats ,get what it needs from factory.new thermostat,new housing ,any new belt.most new water pumps has steel impellers