hi there.i would say a faulty tremostat.or a block radiator.
as for bleed a cooling system on a nissan remove top heater hose full up with water in till
it run runs out of it refit top up make sure heaters on hot. run and let ilde in till you see a flow in top
of radiator. means tremostat open,,make sure the fans are working..take for a drive ..let cold down recheck top up.
then you should be alrigth...
p/s if get to hot they do head gaskits...
once i had fins missing on water pump is possable
23 years in the mechanic trade