Could be a broken thermostat, when the small bow from thermostat stopp the membran, it can not longer move.
So, your water chanel is closed.
It could be your problem.
Zitat:
I bleed the air out of it after I filled it back up
You opend the screw for air out on the radiator next to the fill in cap ?
The engine should stand higher as the rest from the car, so it is easier to bring the air out from the engine.
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Es wird immer nur eine Marke geben mit Freude am Fahren und das ist BMW.