Not a lot, really. Dump it, Fill it with water, flush it out with an up to temp run, Twice, Dump that.
Stick a coolant system cleaner through if you want,
Then re-fill with correct coolant.
Basically 2 x water flush & dumps is enough to remove the wrong coolant from the system.
"Coolant low" implies a leak. Start checking pump, Rad connections, matrix etc...
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'Designed by a computer, built by a robot, and driven by a f***ing nutter'
'09 XC70 SE - 2" lift, D5 225bhp, poverty spec.
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