Quote Originally Posted by Liquifire View Post
when you fill the radiator up leave the cap up and let the system circulate. keep filling it up as it circulates and this will allow the air in the system to leave through the open radiator cap. Do you have dexcool in there?(original orangeish gm coolant) or do you have yellow stuff or green stuff? The waterneck bleeder is there to help the system clear out any air bubbles in the system as well. Do this a couple of times. Get the motor completely up to temp while doing this procedure. Make sure that it gets up to temp, the thermostat gets up to temp and it all circulates properly. After all of this happens top off the fluids in both the radiator, and the overflow tank. Seal it all back up and run it. Did the fluid look normal when you did it last?
We will do that when we get another radiator...I know that my stepson had been adding water, but I don't know if he did it at the overflow tank (probably the right way) or at the radiator cap (which probably allowed air into the system)...does the pressure build to a point that it could crack the radiator if the cooling system is not bled properly?