On my dad's 2003 Dakota, the blower for the heat and AC stopped working. The defroster and AC work, but they just don't get blow out into the cab. Neither the fron or back vents work. Anybody have any ideas? I am sure that it is some sort of relay, but I have no idea where to start. The fuse seemed good. Is this something that I can fix or is it a mechanic thing? Thanks in advance.