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At my 5000km services the coolant is tested and if not up to spec it is flushed and replaced.
When the radiator was replaced recently it was just a couple of weeks after the the most recent 5000km service when the clutch master cylinder was replaced after 27 yrs! Two weeks later the radiator was identified as suspect and was replaced. I assume the system was flushed out again but to be honest I didn't ask. I do assume tho that the system was again flushed as new fluids were used.
Sorry to sound vague but the 4 x 4 guy who does my servicing and repairs has my full confidence and has not let me down over the last 15 yrs so he does what needs to be done when its needed.
If you are in SW Vic you are not too far away from a really good turbo etc guy that I used to use when I was down that way. He fitted my turbo and nothing has had to be touched since the mid 90's apart from a seal in the pump due the diesel composition being changed.