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I got a 05 450r and I went riding this weekend and my bike got hot and the fan kicked on for about 15 seconds like normal but then about 5 minutes later it came on again and it has not shut off since. I started my bike again today and the fan came on right away. I was wondering if anybody knows what going on with it.
 

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I would try the sendor......it maybe faulty. Once the temp reaches the setpoint.......it closes and turns the fan on. You should be able to check it with an ohm meter. It should be normally open, so if you check now and its a closed contact thats whats turning on your fan.
Its located by the regulator housing.
 
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