The fan motor is very easy to test. There is a power wire with a rubber cover on the connector and a ground strap or wire. Be sure the ground strap is in place and making contact. Now pull the power wire off and connect a +12V feed directly from the batter positive terminal to the motor terminal. If the motor works, the problem is in the control wiring. If the motor doesn't turn, replace the motor.
I'll go about testing the fan motor when I have more time. On the other hand, I have a suspicion that it might be a fuse.