climate control knob

[sohile]

What i am trying to say is that, the climate control was working fine and very good, then suddenly left knob was not working properly, when this left knob is at max cold the air coming is cold , but when i just rotate it just one step clockwise to get less colder air, the air becomes sooooo hot as if it is in max hot. Also this led showing snow sign is not lit at night ( the whole knob not lighting) only the small horizontal orange led is on.

need your help plz

thx