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The actuator probably isn't getting power. Have you checked for power at the connector to the blend door actuator?
In the passenger compartment fuse box, check for any bad fuses, in particular the one that I have circled in the diagram below. It is a 10A fuse for the blend door actuator.
Did you check all the fuses? If there are no bad fuses, there may be a damaged wire or the main climate control assembly may be bad. Is your manual climate control or automatic?
I would definitely check all the fuses to rule that out. If the fuses are all good, check for power at the connector using a test light when attempting to change temperature.
If your unable to find the cause let me know and I will have to get some diagrams and diagnostic information to you so you can get this figured out.
This is sounding though like the control isn't doing it's job.