First thing is check the fuses. Then find the resistor pack and remove it front the mounting pins unplug the input leads.
use volt meter to check input voltage. Should tell you what the leads are on the body of the resistor pack. If you get good voltage at that point - turn on the fan control (with the ignition key on) and check to output of the resistor pack. You will have to remove leads from the fan to do this. If there is no voltage on the output side - bad resistor pack, else bad fan motor.
Check fan motor using jumper wires from the input connector that you verified earlier to the fan. These fans have a lot of torque so hold it tightly - may need a helper for this step.
Blown fuse. Burned out blower speed resistor. Faulty blower switch. Bad blower motor.
You either have a blown fuse, defective blower motor, defective blower motor switch, or a defective blower motor resistor pack.
the switch, or the blower motor resistor, or blower motor usually it the last two at one time
It is most likely a bad blower motor resistor. Replace the resistor. If the problem continues, it could be the switch.
Bad fan switch Bad fuse Bad resistor pack on blower motor Bad blower motor
Blower motor fuse is blown. Blower motor resistor burned out. Blower motor switch bad. Blower motor bad.
Blown fuse? Bad blower motor? Bad blower motor resistor? Bad blower motor switch?
Check to see if you are getting power to blower motor - if so replace blower motor If not check fuse, switch, resistor pack.
Defective switch, resistor pack, or blower motor.
Could be, Blown fuse, Bad blower motor, Bad blower motor speed resistor, Bad blower switch,
Assuming you are asking about the HVAC blower motor, check the condition of the switch and the electrical connection at the switch. And, if the original resistor was burned out the cause is usually because of the blower motor drawing too much current. If so, replace the blower motor or you will burn out another resistor soon.
Could be, a blown fuse, a bad blower motor, a burned out blower motor speed resistor, a bad blower motor switch,