When was the coolant replaced recently?
Easy way to check is to see the system is pressurised, or bubling. But I would check for leaks. Leave something carboard under the engine bay to check for leaks so then you can trace.
And we have bubbles, lots of bubbles in the coolant tank.
This was after running at idle for around 5 minutes.
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@mi7rennie started
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When was the coolant replaced recently?
Easy way to check is to see the system is pressurised, or bubling. But I would check for leaks. Leave something carboard under the engine bay to check for leaks so then you can trace.