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Hello and welcome to just answer. I value your input to my questions so I may help you better. These controls are cable activated so you need to remove some covers under the dash to gain access to see the cables connected to the heater box controls.possibly one has come off or broke. It will be the one to the direction door usually on the driver's side of the heater box. If you pull the carpet near the accelerator pedal back and the plastic cover off you should see it.Then operate that control and see how it moves.
There are three screws that hold the actuator motor to the side of the box. Click the link below to locate the screws . These top 2 screws are not accessible because they are covered by the large rotating cam device. If you look very closely at the white plate and in the center there is a lock tab usually about at the 12 o'clock position depending on where you have the controls set at. Use a small screw driver or pick to release this tab then pull out on the white cam plate. The tab is on the circumference of the center shaft. You will only see a slit slit or gap. The picture in the book sucks. lift the small tab up or away from the center shaft and the claw will clear the groove in the shaft. I will supply pics to help you if your going to try and tackle this yourself. As you'll see the white plastic plate. The red arrow points to the tab that has to be released in order to remove that plate. The two screws in the circles allow you to remove that plastic bracket. Sometimes you can rotate the actuator far enough so that it will clear without removing. Make sure you get everything lined backup in the proper holes and slots when you put it back together.
Ifyou see every thing is ok at the heater box connections then you will have to remove the controlls and check there.
I will look what I may find and send it to you Have a good Thanksgiving.
here is what the blend door actuator looks like If you can move it manualy and achieve what you want then check the cables or control