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from what you are saying fixed it it sounds like you dont have it full of antifreeze. you should use a fill funnel as it gets the fuild level above the highest spot in the system thus eliminating air pockets. which will cause the t stat not to open and can make it overheat while not having...

i would get a inferred thermometer to see what the temp of the in and out is at the heater core .if the heater core is plugged only the in line will be hot if both are the same as engine temp i would look into making sure you dont have any broken vacume lines and that the actuator for the bypass...

check the heater hose temp when it is up to opp temp if one is hot and the other is cold you have a plugged heater core -very common or possible bad heater bypass valve