AC Question

why would the lowest setting on the AC control nob not work? what would cause this. the other settings work, but the AC fan’s lowest setting does not… any ideas?

My first 2 settings dont work on heat or AC
this is really annoying
also doesnt seem like the climate is perfectly right either

a/c fan

check the blower resistor located behind globe box by the blower motor.cost about $15.00. 99% of the time bad resistor.