Accepted Answer

There's a door that frequently breaks above the blower motor. It's for the recirculation/fresh air option and when it breaks it drops straight down on to the blower output area. If you remove the screws (three) then the blower motor should drop out of the bottom. With that out of the way you should be able to reach your hand up in to the case and see if the door has broken off.

Unfortunately, if the door is broken it will require removal of the dash and then removal of the box. Seperation of the box is then needed because the door does not have enough movement inside of the case in order to remove it through the blower motor opening.

This is rather common problem on the 02 and newer rams when the customer complaint is blower motor works in all settings but air volume output is not sufficient regardless of mode setting (defrost/vent/floor).

Let me know if I can help any more.
Doug