Loud clicking noise in dashboard

I don't think a temperature sensor would cause this, since the vent all seem to work okay the only vent you would not be able to notice is the fresh air blend door, when the noise is occurring, please put your hand on the actuator to confirm the problem. Here is the location in the diagrams below. This does sound like a classic blend door issue. Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.