roywesley2003 12/13/2012Typically the failure points on these Jeep systems are the fan speed selector switch and the climate control knob which has all of the climate functions on it. Remove the climate control panel and look for burned wires on the pigtail which is plugged into the climate control panel you just removed. I would like to blame the fan speed selector switch but it will fail in all speeds except wide open where there is no resistor to slow the speed down. Since you have zero fan speeds do as described in the previous answer and jump the blower motor with 12v directly. If the blower works (It usually does) concentrate on the pigtail connector at the climate control knob I just described.