So i just replaced my upper coolant cover(where the bleeder screw is located) and went to bleed my coolant and i cant get any coolant to flow through the top radiator hose. I put as much coolant as i could in the radiator and i had let the motor run till operating temp and had the heater on. And when i open the bleeder screw nothing comes out, when i squeeze any of the rad hoses i see steam come out with maybe a little coolant I didi this a few times. I read that i should go drive it around but i am afraid that i might hurt the motor some how. Anyone have this troblem before or know how to solve it? Oh yea the motor is a dohc ZC