Join Date: Aug 2013
Location: huddersfield west yorkshire
Car: mgf 1.8mpi, 4.7 v8 grand cherokee, yzf600r, sym200, fiesta ecoboost.
All you can do at this stage is bleed the system at the usual 3 points,rad top, heater bleed nipple and the screw on engine then give it a run. it is possible that one of the jiggle valves is stuck or worse case has a small leak past the fire ring on the head gasket, a run over 30miles it would show up with air in system again,ticking over in my experience for 3hours doesn't allways show up, a sniff test would allso diagnose the same but not allways accurate in my experience. A hgf doesn't allways give water oil mix. Hope your lucky and have no hgf but its not difficult or too expensive if it is.