airflow panel controls

THERE ARE VACUME OPERATED DOORS AND FLAPS THAT OPEN AND CLOSE BY A VACUME DIAPHRAM THE DIAPHRAM COULD BE BAD OR THE HEAT AC CONTROLER COULD BE BAD OR A VACUME HOSE DICONECTED CAN DO THIS ALSO SOMETIMES PEOPLE HAVE THINGS ON THE DASH BOARD THAT FALL DOWN IN THE DEFFROST CUCTS AND JAM THE FLAPS. IT NEEDS TO BE CHECKED OUT FOR VACUME HOSE OFF FIRST