I have drained the coolant on my BX 2660 which I found to be very difficult due to the placement of the drain plug.  I was able to remove it after much time spent but also removed the lower radiator hose to spend up the process.  However after flushing the system with water 4 times I refilled with a 50/50 mixture of antifreeze.  Much to my dismay I was only able to pour only about 2 quarts into the radiator.  I suspect the coolant/water in the block did not drain.  
So my question is how do I completely drain the system? As I am unable to get the proper antifreeze/water ratio.
	
		
			
		
		
	
								So my question is how do I completely drain the system? As I am unable to get the proper antifreeze/water ratio.
 
				 
				
		 
 
		