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You may want to try your fan on all speeds. If it will work on high, you have a bad resistor for the fan motor. ( high speed doesn't go through the resistor ).
If it doesn't work on any speed, I would check the following;
1. Make sure the fuse isn't blown for the fan blower motor.
2. Check, or have checked the wires between the fan control switch and the fan blower motor.
3. Have the fan control switch checked.
4. Have the fan blower motor checked.
Check the blower motor speed control resistor pack is ok. (The resistor pack is usually located in the blower fan ducting in the air flow). Check condition of electrical connection terminals on the blower motor circuit - these terminals pass considerable current and over time may fatigue overheat and loosen. Check operation/replace any blower motor control relay, Check the blower motor will run if +12v directly applied to the blower motor. Check operation of the blower motor speed control switch is ok.
Check fuses, there may be more than one fuse that controls the blower motor. If fuse is OK, then check relays (somewhere in a box). If relays and fuses are OK, then check (some dashboard dissassembly required) if voltage is getting to the blower motor. If there is voltage present, then suspect burnde blower motor, or if motor works only at full speed, then suspect a burned resistor in the blower motor assembly.
If blower only works on high speed I would say blower motor resistor but if it does not work at all I would suspect blower motor. Make sure you are getting power to motor if not it might be blower motor switch.
Ok, first off, check the fuses under the dash. If they're all good, does the blower work only on high speed? If yes, then you have a bad blower motor resistor, which is located under the hood, near the blower motor itself. If the motor doesnt work at all at any fan speed, make sure the wiring harness that plugs into the motor under the hood is clean and tightly installed. If it still doesnt operate, sometimes tapping on the blower motor housing will kick it on, but if that doesnt work, you may have to replace the blower motor. They are available aftermarket, and arent usually too expensive.
Two possibilities I can think of. #1. The blower motor itself is dead, or #2. The blower motor resistor is fried. Blower motor resistor, however, is more known for taking out certain fan speeds, such as the lower fan speeds.
if you can reach the blower motor, it could be a worn out carbon brush of the blower motor. if they are, buy a set of carbon brush, learn how to replace them and it would be back running in no time. by the way, when you pull out the carbon brush holder, make sure you dont interchange the position. you can put them back wards and what would happen is the rotation will be reversed. either you reversed the carbon brush holder or just simply interchange the wires that are coming to the motor. i hope i was able to help...