Pontiac Repair: heater core, grand am gt, bleeders

Question
i changed the heater core in my 96 grand am gt 3.1 3100 and i want to know how to bleed the air out of the system cause when i put the anti freeze in it wants to just push it back out of the bottle. i tried filling it and i left the bleeder open on the front of the motor and im still not getting all of the air out. i just need to get all of the air out and dont know if ther is another bleeder on it or not? THANKS!

Answer
should be two bleeders one on the engine and one on the thermostat housing, it is very hard to get all the air out, do not fill the bottle up all the way, start the engine with the bleeders open, let run for about 30mins, then close, shut off motor, let cool and top off