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My radiator fan is turning on and doesn't turn off, even though the temperature gauge is showing the temperature to be fine. A couple people posted it sounds like a faulty fan switch. New switches seem to be running about $70. I would like to test my switch somehow to see if it is indeed the switch before buying one. Does anyone know how to do that? Has anyone encountered this and been able to fix the switch, maybe due to a bad connection, corrosion or something?Thanks!
 

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From what I have been able to determine the fan switch opens and closes the ground for the fan motor circuit. It should be normally open whenthe engine is cool, meaning the switch contacts inside of it are not touching so the circuit is not complete. When it reaches a e contacts set temperature the contacts will close or touch and complete the path to ground and the fan turns on. If the fan is running even when the motor is cold disconnect the wire from the fan switch, if the fan stops running the switch is stuck closed and needs to be replaced, if it keeps running then the insulation on the ground wire may be broken somewhere and touching some metal which would also complete the circuit and cause the fan to run. Hope this helps.
 

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yep didn't think about the relay but the fan switch actually completes the circuit to close the relay to send battery power to the fan so it could be stuck too. Download the manual herehttp://www.mediafire.com/?mj7z818grhbdy3x go to page 15-40 and 15-41 it shows the circuit and also tells you how to test the fan switch in boiling water with an ohm meter
 

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My radiator fan is turning on and doesn't turn off, even though the temperature gauge is showing the temperature to be fine. A couple people posted it sounds like a faulty fan switch. New switches seem to be running about $70. I would like to test my switch somehow to see if it is indeed the switch before buying one. Does anyone know how to do that? Has anyone encountered this and been able to fix the switch, maybe due to a bad connection, corrosion or something?Thanks!
There is a brief explanation in the Kaw service manual on page 15-41 for testing the fan switch.
http://www.vn750.com/forum/showthread.php?t=17667

There is a more detailed explanation in the Clymer manual that I have typed out a couple of times on this board, but you will have to search for it tonight as I`m too lazy to do it again.:(

Quick check is to pull the wire off the switch- the fan should stop.
If the coolant temp is below ~200*F and the fan comes back on when you reattach the wire, the switch is faulty.
 

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Git-R-Done!
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I have been experiencing this same issue intermittently for some time, but it typically happens only after riding on the highway for periods of 20 minutes or more.

It looks like some great tips have been posted here. I will give them a shot myself. For the time being, I have just been unplugging the fan when it won't shut off. It's a bit of a pain, and if I forget to plug it back in, which I have done, issues arise.

Thanks for the tips all : )

AZ Kev
 

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Git-R-Done!
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Ok - I have still been experiencing this issue intermittently, and recently disconnected the wire from the switch (pulled it off), and the fan kept running. So from what has been posted here, it sounds like it could be the ground wire being cracked and grounding out somewhere. Where exactly would I check for that? Would I just need to follow it back from the switch?

And is there still a chance that, if the fan keeps running when the switch is disconnected that it could be the relay sticking? I am not super knowledgable about how the wiring goes on the bike, so.... As always, any and all advice/wisdom appreciated : )

AZ Kev

PS - yeah, it's almost October, and I still gotta' deal with this, because I live in the over - er, Phoenix! Lol
 
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