Where is the actuator that will change the direction of air flow?

I have found both the blend door actuators for the drivers side and the passenger side. I have also found the actuator for the recirculation. I cannot however find the actuator that will change the direction of air flow. I am stuck in defrost mode no matter what I turn on. Hot and cold work great on both sides and will work independently of each other. But still only blows out the defrost. Where is the Mode door actuator? Any help would be appreciated.