I had same problem. Blend door broke off and landed on top of blower fan. Could here fan blowing hard but hardly any air coming out. I removed glove box door, then cut out part of the plastic covered up by the door, ( you wont see it once you put the door back on). Then removed blower motor and could reach up into the ducting and remove the door. I cheaped out and taped the door back in place over fresh air vent. I wasn't concerned about getting fresh air in.

To fix it correctly you will prob have to replace the electric motor that opens and closes the door and the door since it will probably have the splined end broken off.