Draining the cooling system of the Mk5 Mondeo diesel

[LunaCraze]

Can someone inform me of my error? I am attempting to empty the cooling system, with the heater set to high. I have opened the drain tap at the bottom of the radiator and removed the cap from the expansion tank, nevertheless only approximately 3-4 litres have been expelled. What additional steps should I take?

[NightHawk47]

It will not completely expel all of it unless air is forced through the system, likely a significant amount within the engine block and the vehicle's heater.

[LunaCraze]

I utilised a cordless blower in the expansion tank until no fluid emerged from the drain faucet; nonetheless, only approximately 3-4 litres were expelled.

[LunaCraze]

Which hose must I detach to introduce air and expel the majority of the coolant from the system? Clearly, when I proceed with this, the thermostat will be closed; hence, I may need to detach multiple hoses surrounding the thermostat housing. Which hoses would facilitate this process?