Yaris 2009 heating knob issue

[Pwalk]

It's a minor issue but annoying.

The knob doesn't go all the way to max heat, only turns about 3/4 and stops, something blocks it. I thought it was a problem with the knob so I disassembled it but didn't see anything. It's as if something further down is blocking the cable?

[flash22]

Is the cable moving its full stroke, have you released the cable and turned the knob to see if it rotates

The knobs go brittle over time and the little lugs snap off also, don't rule out the cable mount on the heater box