coolant issue
Also- since your heater line appears to go slightly up from the front of the manifold, did you turn on the heater when filling it? This would help get any air pockets that would sit up in that line after draining your coolant.
Of the coolant you lost: Did you see the coolant on the ground? Where did it go? Due to expansion / contraction, you will see different level from cold-hot-cold. Has the level stayed constant in your expansion tank?
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