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Yes, give it about fifteen minutes or so, but watch the coolant when the cap off.

Would an oil analysis show coolant in the oil? Might want to have that done if the block tester shows negative.

It's been years since I used one (still have it somewhere) but, removing the cap while under pressure is dangerous, so warm it up without the cap. Two ways to tell is to watch the coolant start to move (thermostat opens), and by checking coolant temp with a thermometer in the radiator neck.