On my coach there is a small diameter hose coming off the top of the thermostat going to the surge tank. It circulates quite a bit of coolant through the surge tank to back to the radiator. Any air will be purged via the surge tank.
If yours has a similar setup I'd advise to check the small hose from engine to surge tank, mine was very hard and brittle when I changed the surge tank so I changed it.
2002 Monaco Windsor 38 PKD Cummins ISC 350 8.3L
2005 Jeep Grand Cherokee w/5.7 Hemi