Just completed a 900 mile round trip with no passenger side heat. Needless to say, the wife was not pleased. Heat came only from diver's side feet and dash vents; no heat from passenger side. Defrost works fine, fan changes speed on demand, just no heat on passenger side. Blend door problems seem to be blocked flow, not lack of temperature.

Any Ideas?

 

Probably a broken damper. Heater treater has the fix. I have their complete set of dampers in the garage, waiting for me to put them in. Craig