Pull the radio bezel off, remove the radio, then you should be able to remove the center panel vent tubes. Through that hole you will be able to reach the mode door. The blend door is for temp control.
If you look from the drivers floorboard up and toward the firewall, you should see the blend door actuator with a plug going to it, the mode door actuator is higher up and closer to the fire wall.
When the mode door actuator(2 screws), blend door actuator(2 screws), the driver side front floor duct(2 screws), and the actuator mounting bracket(3 screws) are removed, you should be able to get to the defrost door lever and gear assembly, mode door cam, and panel door gear.
It will be tight going working under the dash, but maybe you can find out whats going on with everything exposed.
This is the best
How-to I've seen. It is for a KA but the KK is very similar, if not exactly the same.