I filled the upper radiator hose and removed the bleeder screw. It still ran hot. I filled the thermostat housing by means of the bleeder hole and still runs hot. I replaced the thermostat and the same. The upper radiator hose has hot water in it and the top of the radiator is hot. The lower radiator hose is cold and the heater lines are cold. I have almost 3 gallons of coolant in it. I tried parking on a steep hill too. I will try filling the rear block hose next.