03 Elantro won't allow vent selection
 

The heat control unit to select which vent does not work. Cannot select floor, vents, defrost, defost/floor. All it does is blow out the vents. Any suggestions??? I meant Elantra in Title :p

Anyone?
 

Daughter's car just had same thing happen 03 elantra. How do you access behind selector switch or is there another quick fix before going in behind the panel.