Lots of good suggestions above. I'd start with finding out where the coolant is coming from. If that doesn't pinpoint the problem, I'd check radiator cap and pressure test the system. As mentioned, you need to purge air from the system after fixing problem.
Not sure if this works with modern cars but we used to get an idea of what shape the pump was in by removing the radiator cap (when engine is cold) and watching for flow - no flow means bad pump.
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