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The fan is controlled by a thermo switch . It's located on the radiator and has power going to it always and when temp goes up it grounds circuit and fan come on.
There are 2 sensors for temperature. One near T stat housing for ECU reading. Other one in water passage for the light. The ECU turns the fan on by tripping the fan relay. The light comes on to tell you it's too hot. Check fan to make sure it turns. Check fan fuse to make sure it's not blown. Unplug fan motor and hot wire it to make sure it runs. If it does, locate fan relay and swap it with one of the others with the same numbers on it to see if fan comes on when engine heats up. If fan cycles normally the temp light sensor is probably bad.
2011 Polaris Rzr ranger there is a fuse in line under the floor pan below the battery that gets corroded on the main wiring harness removed and relocated above the backseat try that you could buy one at Napa for under $10 try it I had the same problem with mine good luck
Sounds like your heat sensor is bad most are attached to the radiator in the Cooling fins..to make sure the fans are not the problem..after the engine is warm enough to turn on the fans locate the sensor and unplug it then using a jumper wire "paper clip or any small wire " as a bypass connect the two wires together "the plug end" the turn on the switch..the fans should run as long as the switch is in the on position..if it does your sensor needs replaced...note if you are out where there is no help and the fans are shutting off and the engine is running hot..just bypass the sensor until you can replace it..Just make sure it shuts off with your ignition switch off..or the battery will drain..good luck
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