95 240sx overheating

[kingman43]

I have a 95 Nissan 240sx that has been over heating..I replaced the thermostat radiator and the water pump...All looked like they were ready..I'm having one hell of a time getting all the air to purge from the cooling system..Is their a trick to these motors or a freaky problem with them that causes the over heating..It's a 2.4 liter..I have used the air bleeder at the top radiator hose and I'm still having problems getting the air lock out...What happens is the car will run fine and stay at normal temp then the gauge just rockets to the top and that tells me air is still in the block..Ok,guys whats the trick here..Is there something else going on????...I need your help...

Thanks,

Bruce from NC...