you have to bleed the system over and over. Make sure there isn't an air pocket under your t-stat. you can also drill a small hole in the t-stat to make sure there isn't one. and when you run in for a while you can feel where the air pockets are in the rubber hoses that connect the tube to the radiator or the motor. also add your antifreeze and take a hose and put in the radiator and close the rest of the radiator with a towell or something. it actually works. my old man told me. also they make some bleeding kits i hear. you can pick them up at like a parts store. and hook it up to your heater hose lines.
