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Kawiherder

2004 500 cooling fan not coming on.

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It starts and runs Ok but after a while the temp gage lights up and the fan fails to start.  Any suggestions on where to start looking would be helpful.  Thanks

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Whats up @Kawiherder what year make and model? Im assuming Kawasaki by your name. 
That light comes on from a sensor in the top of the cylinder head that acts independently from the fan. 
If its water cooled then there is a sensor on the right side of the lower portion of the radiator. Take the two wires off that sensor and jump them together. If the fan comes on then the sensor is bad. 
If the fan does not come on then the power going to that sensor needs to be checked. Thats done by using a simple test light or tester. One of the wires on the sensor  should have 12V power on it. If not then start tracing that wire back to its source, maybe fuse or there are inline circuit breakers on the wire to the fan on some models. 

Now if you have power at the sensor and when you jump the two wires on the sensor and the fan does not come on then it could be a bad ground on the sensor or a bad fan so you have to start looking at the fan itself and the wires coming off of it. 
 

All of the above testing needs to be done with the key on. 
 

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Make and model are Arctic Cat 2004 500 BTX with the Suzuki motor.  Kawiherder, aka Interceptor398 are from my sled site and collection and I have used them in more than a few places.  Your reply is the starting place I was hoping for and I thank you for that!!

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Is it simpler to remove the covers to work on this?  I can see the connector to the fan but that is about it.  I've never had one of these apart so it is a new adventure for me.

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Its always easier to work on without the plastics just not easy to take the plastics off! 
 

I  don't think you need to pull the plastics off based on the problem your having unless you need to pull the fan. Then you may need to take the front one off.  
Post a few pics of you can so we can help you along and make sire your on the right track. 

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First check the fan fuse to make sure its good. Your model is a liquid cooled so the sensor is mounted near the bottom of the radiator. Unplug it and with the key on, jump out the two pins on the wiring side and see if the fan comes on. If it does not, check to see if one pin has 12 volts to ground.

Typically the fan is also a 2 pin plug, you can disconnect it and run 12 volts directly to the fan to check to make sure its good.

There is also a diode in the circuit that prevents the fan from backfeeding into the wiring, this may have gone bad, on your model it shows it as an external part, on later models it was inside the wiring harness.

Mike

 

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