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I'm assuming cooling (rad) fans? Try tapping the fan motor housing to see if it will start. You can try unplugging the temperature sensor and see if the fans come on. Also you can try running 2 jumper wires to the fan plug from the battery and power it up directly to see if it works. Usual causes are a bad relay, temp sensor, or fan motor. Could also be an electrical (wiring/ground/ecm) issue.
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