I'm trying to find the correct procedure for bleeding a Grand Prix SE 3100 V6. There is the two bleeder valves and confuses me. The book says to fill radiator with both bleeder valves open. if coolant comes out close the bleeder valve otherwise close after the radiator is topped off. I have tried that method and it seems i have either air trapped in my system. Right now i'm starting the car letting warm up to operating temp, shut off cool down open radiator cap and top off with more coolant. Need help plz