2003 Dodge 1500, with no heat. Radiator full, both hoses were hot to touch. I took the dashboard apart to access box thinking one of my doors were broken, but it seems that all the actuators and doors are working. I drilled a one inch hole in the box to see if the center door was working, and it is. (the one actuator that has a rod connecting to a second lower door) I believe that these doors are for air temperature. If they are, then I’m looking at possible plugged heater core I guess. Anyone been here?