Does it have an electric control actuator ? An it's mode door not blend door . Mode door controls where air comes out of , defroster , vent , floor etc... an the blend door controls the temp. Pull the mode door actuator an see if the door move's freely , not binding . After replacing an evaporator if everything was put back right you shouldn't have this kind of problem . There is no relearn for the door actuator . Double check your work is the best answer anyone could give !