Agreed on the confusing wording re: bleeder screw. It should not be open when bleed cycle is running. Cap should also be closed on expansion tank.
Did you have the heat on high while running the bleed procedure? It’s definitely possible there is air trapped in the system. Do other vents blow hot?
I’d run it again and ensure the heat is set to max. See where that gets you. The bleed procedure runtime you experienced sounds about right, as I believe it isn’t necessarily exactly 12 minutes. I could be wrong about this though.
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