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@Dammit
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Erm, Yeah, the coolant does absolutely mad stuff. it actually goes away (from the expansion bottle) and comes back from nowhere.
You stop when you get a low coolant warning and the bottle is dry. Give it 10 minutes standing and it's all back again. You can't top it up enough to stop it becoming empty because as soon as you open it the coolant all comes back. You have to overfill it when it's cold as there will be airlocks in the system somewhere and when the engine warms up they return to the expansion bottle.
I did a 3,000 mile run with it like that. It isn't terminal, the engine doesn't "blow" you can keep running but coolant management becomes an important part of driving.
It's worse when the engine is warming up.