I'm not familiar with your model, but you will need to do some electrical
troubleshooting.  A service manual will help identify conductors.
If you disconnect the plug for the fan and run jumpers direct from the
battery and the fan turns on, you problem is probably a relay or temp
sensor.
If the fan does not turn on when jumped. it's probably worn out and needs to
be replaced.
Again, not sure on your model, but you can usually test if it's the temp
sensor by disconnecting the sensor and grounding the wire that was plugged
into it.
A service manual will help you there.

Good luck,
Rich