first my car overheated and blew the radiator. i just changed the radiator today and the manual says 10.5 litres is the capacity of the cooling system. well i probably added 5 litres at the cap and it would not take anymore even with that screw next to the cap opened(i'm guessing its for letting the air out). so i turn the engine on and the level would not go down at all so i figure that its full. but now my car is overheating and the coolant level isn't down. i have five litres in there unless there was some left in the engine even after taking the radiator off. WHAT'S wrong ? is it my water pump. am i missing something?? please help. thnx zaidoun