Puk'in Fluid

Raising the front will not trap air, and that is not your trouble. An air lock causes "non" circulation, and if both hoses are warm, that ain't the trouble. If water level is still up after running a bit of time then there's no air problem What do you have for a fan?

I'm still with TB. Find someone with a "blok test" (chemical test) for combustion leakage. Not sure, you might be able to take a sample in a sealed container to a shop for test. The exhaust gas becomes absorbed in the coolant