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Maybe pull the heater box and work back . That way you can see if air is actually going threw the core ? Then if something is plugged you can use compressed air from ur truck to blow it out without plugging your heater core.

if the vents in the cab are jammed or not moving, and or blocked. The air has no where to go and would do this. worth a check to make sure mini and micky didn't build a nest in there somewhere.