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fyi the heater core in the boxster is always 'hot'. other cars use valves in the coolant lines to close flow to the heater core. the boxster does NOT do this; it uses air flaps to direct air toward - or away from - the heater core.
as to the vacuum system? i've emptied & filled my system several times & never had an issue. open the bleed valve & fill the system with coolant. leave the cap off & run the engine to operating temperature. top it off & close the cap. with the bleed valve open, drive around a bit. the bumping & shaking from the road will generally push the air to the top of the system & out the bleed valve. top it off, close the valve, & you're good to go.
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