good morning gents, i just drained the old coolant (i can tell it's been there for a while!), added 50/50 mix, let the engine run for a bit, drain again, and then added 50/50 mix (OEM MB fluid).

I'm a bit nervous about the MB cooling system coz i do not see an extra reservoir. anyway, i have the heater set at max and i've let it reach operating temperature. how do i make sure all the trapped air is purged from the system? thanks !

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Current cars:
2001 MB E55 AMG
2003 Honda S2000
2000 Honda CRV

Gone but not forgotten:
2004 BMW 325i 5sp sport
1999 BMW 540i sport
1997 MB E420
1995 BMW M3 coupe