Video didn’t upload. Here’s a crudely labelled still (Hard to draw on a small photo on the phone!) The red arrows point to the wheel and lever, and the yellow arrows show how they should move when you turn the control.
Having now looked (for first time) in the car, unlikely the cables come off this end... but may have from the control. Take these panels off and have a look and tell us what you see. If *both* the wheel and the white lever below it don’t move, then the cables come off the control knob. If one moves and one doesn’t, time for more exploration
It often seems that in a car factory they start with the heater and build everything else around it!