so my sister has this POS cavalier that needed a coolant flush. I drained the coolant, and now that its time to fill it, it wont fill. Stupid ass GM didnt use a normal cooling system, they had to use one without a radiator cap. it has a little bleeder screw in the hard line to the heater core, but that does nothing. I can let the car run for a long time with the "overflow tank cap" off and there are no air bubbles coming out, but you can feel the coolant sloshing in the hoses. How the hell do you bleed the air from these piles?