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The resistors are in circuit only on the lower fan speed settings.
On the highest speed setting, power is switched directly to the fan motor.
Check fan power supply fuses,
Check power is available to the fan when high speed selected.
If all above OK, apply power directly to the motor to verify fan motor runs- if it doesn't the motor may need replacement/repair.
unhook the battery find the blower motor unhook the power connection wire it will be a male female type connector most likely unhook it and remove the bolts securing the blower motor to the housing it should pull out with minor effort it will probably seem to have glue but it will be a gasket usually made of foam that sticks to it. If the foam is badly damaged find some simular foam at the hardware store reinstall reverse of removal.