Think I know what my problem is, but I just want to see if I'm on the right track and if there is anything I might be missing.
The air output on my 01 SSEi will only blow out of the dash panel vents. Won't change to floor, defrost or anything else. If I press the Auto button, it appears to be on, but the blower motor won't activate, but it will if I do it manually.

Is this a problem with the door mix actuators? If so, is it one or all of them? Or is it with the head unit itself?

Thanks in advance for any advice