ac and heat problem on 2009 Toyota Corolla

my corrola's ac and heat has to be on number 4 to heat up or cool' if i put it on 1, you hear it but nothing comes out, the same with the ac. what's the problem? the car will be 1yr old this month.

Asked by for the 2009 Toyota Corolla
This is a blower motor resistor problem. replace the blower motor resistor.