I must be missing something here. My 944 needed an antifreeze flush and refill, so off I went. I disconnected the upper and lower radiator hoses and drained a large quantity of coolant out of the radiator, water pump and overflow bottle. The heater hose was stuck on to the firewall pipe; not wanting to cut the hose, I did not disconnect it, thinking that the upper radiator hose disconnection would encourage the head to drain. I also drained the block via the block plug screw. After refilling and draining again once, I put in what I thought was exactly half (5 qts) of the system capacity in new Dexcool antifreeze. This filled the sytem, so I obviously had another five qts of undrained water sitting in there somewhere. Has anyone figured out how to drain the cooling system down to zero? Can the heater actually hold that much fluid?