It might be three things...
1. The fuse... take it out and inspect it... or throw it away. and put in a
2. Ignition switch... when it doesn't work... try turning your key back just
a bit... but before it shuts your engine off... while you are at stand still
3. Blower motor itself is bad... give your passenger side knee level panel a
kick to see if it comes on... if so, it it definitely the motor that is bad.