Does the blower motor not work on any speeds at all? Check the number 4 setting, if it works on the highest one but doesn't work on any other its the blower resistor.
IF completely inop in all speeds and you already checked the fuse, try wiggling the connector to the blower motor. If that still don't work you might need a new motor. See the dealer if your still under warranty.
If not let us know, we'll help you out.
Izzy 2005 Black CrewCab SS wannabe