96 Cavalier overheating.?

I got a 96 cavalier 2dr with a 2.2 litre and a 5spd. The head gasket was torn and leaking from the driver's front corner of the head. So i had it replaced along with the thermostat as well. Got it back and it overheated right away so i took it back and he put another thermostat in it. It still wanted to overheat, so i got one from a different place and we tried that. Bled the air out of the system for 45min to an hour. Then i drove it home without a problem (25miles). Then the very next morning i got up for work and decided to let it run for 20 min (its cold in iowa) and then i headed out to work, got half way to work (12-14 miles) and it wanted to overheat. So we put a waterpump in it and he bled the air out again. I drove it less than 10 miles and it wanted to get hot AGAIN. We put a pressure tester to it and pumped it up to 5lbs. It held steady, didn't lose any psi, but also didn't gain any either. Only thing not replaced is the head. HELP!!!! email me at bls_80@yahoo.com