Crack a few eggs and pour them into the radiator.
I'm kidding. But really, I heard of someone who did that.
Seriously tho, assuming you bled the system correctly, there's a good chance you're getting air or gas introduced into the cooling system. This results in over pressurizing the system and overheating, which may have cause your expansion tank to rupture. You should do a pressure test on the cooling system. If no leaks are found, try a combustion leak test to see if there is any exhaust gases coming in through a weak head gasket.
bleeding the system could be a factor, i never found any good instructions on how to do it...i used alldata (bro went to nti and had access to it) but never found anything useful. as far as the pressure goes, how would i check the pressure in the cooling system? and i will run a combustion compression check tomorrow. I go and start the car about once a week and the motor runs phenominal w/ 168, xxx on the clock.