Hi Jjad, thank you for the reply. The post you directed me to seems to suggest that removing the block drain plug is more hassle than it`s worth. The problem I have is that draining the system from the bottom hose only removes about 2 litres of fluid. To get a 50/50 mix of new coolant I need to somehow get more out. Am I the only one to have this problem? Any suggestions please. Thank you.