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Do you get power to the fan (12v)? If Yes fan is faulty. If No supply is faulty. Switch grounds fan relay. If you get 12v at the switch with the switch open, relay coil in intact. If you never get 12v at the switch, relay coil is open circuit. Coil should be on a separate circuit from the fan fuse. If coil in intact either fan fuse is blown or relay is not making. A defective relay is a very common fault. Check the fuse box. There may be a similar relay in the box that you can temporarily substitute to confirm my diagnosis.
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