No experience with a 914 however with my 912ULS:
I do my coolant changes at the 2.5 year mark - so one drain in part of hose
replacement
Just remove the lowest coolant hose, followed by the "radiator" cap. It's handy,
not essential, to have a second person to hold a wide mouth container up to
the open hose.
After bulk of coolant removed, I open one end of each lower hose to remove any
"dregs"
After reattaching all but one hose, I do a compressed air blast into the
"spider"
tank (cup hand over opening put air gun nozzle between finger/thumb and blast)
- usually gets a few more drops.
Drain expansion tank separately.
If using same/compatible coolant, within recommended drain interval, no need to
"flush" system.
Be sure to top up using Rotax compatible coolant, mixed with purified water at
the 50:50 ratio.
Squeeze/pulsing of the larger radiator hoses may asset in removing trapped air
bubbles.
Conduct brief test flight - allow system to cool (overnight good) recheck
coolant
levels & top up.
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