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Update! I can manually move the blend door and the heater works great! I need to attach the rod to the arm that connects to actuator. Does anyone have a pic of inside the distribution unit? See photo. I need to understand the position of the rod that controls the blend door.

Thank you! Great suggestions! I have already purged the air bubbles twice in the coolant system. We have the same issue I think. I think the actual door is not moving like your issue. despite engagement by arm. I have everything open where I can see and didnt re-assemble yet. I will try your idea!

I am not getting heat with the arm in up position.

Thank you so much! Any insight how to inspect the blend door?

I have flushed heater core and replaced blend door actuator on drivers side. Inflow pipe temp is 187 degrees and outflow pipe from heater core is 180 degrees, suggesting heater core is working. I sense the heat door closing within the distribution unit is not moving despite engagement with blend...