2002 Kia Sedona Fan switch

On my 2002 Kia Sedona the switch that you turn to get the heat/ac to come on has 5 levels. When I turn it on, levels 1,2,4 and 5 work, but when I put it on 3 no air comes out. What might cause that issue? Also the lighting to illuminate that switch doesn't work, all my other things control temp adn rear heat/air are lit and work. this could be caused by either a faulty blower motor resistor or a bad fan switch. u would need a wiring schematic and a dvom or ohm meter to troubleshoot them.

as far as the lite, most cars now use led's instead of bulbs for dash illumination. if thats the case with this switch, and it probbly is, the only fix would be to replace the switch.