2012 the a/c and heat modes work correctly ….Hot/ cold mix. Air flow mode is stuck in defrost mode. I did not put it in defrost mode I was in auto and something changed . I see the mode door actuator moving the white pulleys when other modes are selected front/ floor front floor mix but no change in air flow . Stumped….I am assuming the mode door would not move the pulleys if it was the problem. .