Hi ,

i have a 03 dually 3500,and the blower for the heat only works on 5.
i checked all of the fuses,and found no bad ones.
does anyone know if this is a common problem?
its still under warranty,but i was just curious.
thanks Michael

I think that the problem is the resistor bank for the blower. If you post a question over in the Ask the Tech's section, they should steer you to the correct component.