I need to add I copied this pattern of method of someone off fourm and what he said makes sense.... I'll let u read and understand what he said that gave me the idea to run a water hose through my turbo coolant line from the cylinder head and flush the engine block through there

Take lid off header tank
Undo bottom hose, wait for radiator to empty
Take coolant line off turbo (not the one coming from the header tank, the other one)
Stick a garden hose into this line, and it will flush through the motor etc. Give it a few mins.
Stick the garden hose into the header tank, this will flush the radiator
Put bottom hose back on
Stick a funnel into the turbo line you flushed through
Pour coolant into funnel until visible in header tank
Take out funnel & put turbo coolant line back on
Top up header tank

I've found this way works best in getting all air out of the system and doing a proper flush. Reason why I take off the bottom hose and flush the motor and radiator separately, is so there is less chance of crap coming out the engine etc into the radiator.

Pretty sure I learnt this method from someone else on the forum