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2012 Commander 1000 XT - The cooling fan comes on within seconds of start-up, runs continuously and then stops when the engine is shut off. No bars on the engine temp gauge. Everything is dry, we haven't driven through any deep water lately. Whaddaya think? Fan relay, temperature sensor?
 

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I would think coolant temperature sensor, especially since your temp guage isn't showing anything. I believe Ace has said that it will default to 'fan on' if the sensor fails (or wiring open).
coolant temp sensor.jpg
 

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Yes fan kicks on if you unplug or sensor goes out default to make sure it doesn't over heat.
 
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