So my car is overheating and I get no heat from the heater. Temp sensor is fine, tested and working. Replaced the water pump. Replaced the thermostat twice(had a nonworking one the first two times, finally got one that passed the boil test.) The upper radiator hose is hot and pressurized when the car is heated up, leading me to believe the water pump and thermostat are working just fine. I ran the car to red line on the heater gauge and the upper radiator hose was burning hot, yet the radiator was ice cold, along with the loser hose and the heater core hoses. Is it possible that I have a clog in the radiator AND the heater core lines, or if it's in the engine how am I getting hot fluid to the upper rad hose? I've been working at this for over a week now and I'm stumped. Anyone have any thoughts?