Heater/air conditioner blower not working?

The heater/air conditioner fan is not working in my 93 88. The climate control says the fan is on high, but it's not blowing. Is there a fuse or something that could be blown or is the blower just bad?

Thanks,
Bobg

Did the fan go all at once or did the speeds go gradually? If it went gradually the blower motor resistor went bad and needs replaced. If it went all at once it is probably a bad fan motor or broken wire or switch.