1994 Oldsmobile Ciera Blower Motor

Hi, sometimes the mixing doors dont adjust correctly anymore or are stuck. And sometimes, the evaportator core fins become plugged up with debris and moisture combination, which makes it almost impossible for any air to pass thru the fins for you to recieve air in the car, if you can access your blower motor from inside the engine compartment, I would pull it out and usually you can see the evap core from there, (just barely) and see if it has debris or dirt clogging the fins, and you can take compressed air and try to blow some of that free and see if you feel a difference