Fridge Side Too cold, freezing

Discovered Yesterday the Fridge side was too cold. it was freezing items.
Cleaned the coils. Did not solve the problem

Damper? Thermostat?

I have looked on the parts diagram and can not find a thermostat.

On a side note I’m not sure I have heard it turn off. I turned the temps up as high as I can and it did eventually turn off.