Hi

There's a blower fuse that could be blown.
It could be that your switch's common connection is loose (black wire)
-- it is supposed to be tied to ground so check that connection.
Check the switch by putting a meter across your blower motor. Turn on
the heat and fan to see the battery voltage. If you don't see that
voltage, most likely your switch is bad. If the voltage is there, but
the blower motor doesn't turn on, the motor is bad.
Hope this helps.
Remco