i have a 1992 7mgte toyota surpa. the entire engine has been rebuilt, pistons rods gaskets, bored over .20 and cleaned. when i got the car back it overheats about 30 mins of driving, i get out and it has burned the antifreeze out of the car completly and because of that blown the head gasket, this has happened two times. no one can tell me whats causing it to overheat, they think its the turbo? but i had it rebuildt as well?? so??? any thoughts?