if fluid started flowing out then it should mean the block actually has fluid. so you're good there.
would u happen to have a coolant system pressure test kit?
if theres a leak in the cooling system and it cant hold its 1.1 BAR internal (~15psi) pressure then the boiling point of the coolant isnt as high as it should be. places to look for a leak are radiator caps, overflow nipples, freeze plugs, heater lines, etc.
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2016 BMW 340i M-Sport / 2013 Chevrolet Volt / 1999 Subaru Impreza RS EJ205