Correct me if im wrong, but my 2007 grand does NOT have dual climate control. with the AC on i get cold air on the drivers side and luke warm air on the passenger side. Im assuming this is the same scenario as the dual climate control with a bad door actuator (though i thought they didnt use dual blend doors)
It does change from hot to "cool" air, just not cold from the AC on the pass side vents.

This is an 07 rocky mountain edition with the 5hp 3.7L