I can't really tell which way or what levels are on from the photos, but I would have thought that the 11 p.s.i. cap should be on the expansion tank , and a FLAT non pressure cap on the radiator. Then when filling unfasten the expansion tank and hold as high as possible or at least as high as the non pressure rad cap. Run the engine, holding up the expansion tank, make sure the heater is open (max heating position) and all the air is out of the system. Make sure you leave enough space in the expansion tank after filling and you should have achieved a closed system.
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