coolant flush - air in system

[Danny]

whats up..wanted to flush all the green coolant out and replace it. Been at it for a while, draining from the coolant hose at the rear of the engine ( as to what the bentley states). Ive been reading the archives on the quattro list and is it really nearly impossible to clear the system of all the old coolant? anybody btdt? Also there seems to be alot of air in the system. Ive been squeezing  the T looking hose that goes to the coolant manifold and to the coolant pump. It seems to be working, just wondering if there was an easier way. Thanks
Danny