the engine coolant temp sensor is what turns the fan on and off i had a similar proplem with my 2007 500 efi and if i recall correctly to reset the engine coolant temp sensor i unplugged it while the machine was running and then that resets the temp sensor... i did mine with the engine cold... thats what i did but i know the 500s dont have fuse blocks either not sure if yours does?? the engine coolant temp sensor is on the left hand side of the engine near where the coolant hoses and thermostat
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