Help...radiator fan won't kick on when engine is hot - Kawasaki ATV Forum
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post #1 of 11 Old 03-30-2011, 10:24 PM Thread Starter
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Question Help...radiator fan won't kick on when engine is hot

I'm trying to figure out why my twin peaks' radiator fan won't kick on when the motor gets hot (the overheat light came on last Saturday during a trail ride, so I know something is wrong).

So far, here is what I've checked.

1) Fuse is good (was a little corroded, but I cleaned up the connection and the fan still does not come on when the engine warms up).

2) Fan works when I directly run 12v to it.

Given that the fuse and fan appear to be good, the only possible cause I can think of is the radiator overheat sensor. Do you guys agree, or is there another possible cause that I'm forgetting?

2007 KFX 730 (sold)
2004 Twin Peaks 800 (sold)
2003 Prairie 650 (parted out)
2002 Prairie 650 (parted out)

Happy trails...
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post #2 of 11 Old 03-30-2011, 10:25 PM
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Most likely the sensor in the radiator.
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post #3 of 11 Old 03-30-2011, 10:33 PM
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Mikey the sra's have some sort of reset thing that you push with something like a pencil.......up under the seat where all the electrics are IDK if the Prairies/Twin Peaks have it too ?


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post #4 of 11 Old 03-30-2011, 10:42 PM Thread Starter
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KFXhellrzr,
That is my guess too. It looks like p/n 27010-1202: SWITCH,FAN for 2004 KAWASAKI Prairie 700


Kawboy1,
Thanks for the suggestion. I might be wrong, but I think you are talking about the Brute Forces which have some kind of breaker box (which can be reset) instead of a fuse box. My twin peaks has a fuse box.


Happy trails...

2007 KFX 730 (sold)
2004 Twin Peaks 800 (sold)
2003 Prairie 650 (parted out)
2002 Prairie 650 (parted out)

Happy trails...
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post #5 of 11 Old 03-30-2011, 10:48 PM
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Yes thats right the breaker is right opposite the fuse block under the seat and pretty sure there is a fuse as well......I didn't know if the twin peaks was the same setup?


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post #6 of 11 Old 03-31-2011, 05:02 AM
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Let us know if the temperature sensor was the culprit.

2008 Brute Force SRA
VFJ Stage 3 clutch, EPI pink primary and VFJ #4 secondary springs, Dynatek, spark plug boot mod, Crossover intakes, polished slides, shimmed needles, #42 pilots, #140 mains, TRP water pump, Faria temp gauge, Napa hose mod, Twin Air power flow kit, Elka front spring kit, Elka Stage 3 rear, Fasst Flex handlebars, Rox risers and dash, ODI grips, Streamline steering stabilizer, PRM grab bar, aluminum skids, Renegade footpegs, Black Rock wheels, Kenda Bear Claw HTR's
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post #7 of 11 Old 03-31-2011, 05:03 AM
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I am betting so. Last person I told on this same problem bought a new fan along with some other stuff they didnt need. Temp sensor is it more than likely.
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post #8 of 11 Old 03-31-2011, 05:08 AM
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I agree with you. My brother in law wanted me to put a new fan on his 750, but after I ran a test wire directly to the fan, it worked fine. I had him take it back and get a temp sensor. It fixed it right up.

2008 Brute Force SRA
VFJ Stage 3 clutch, EPI pink primary and VFJ #4 secondary springs, Dynatek, spark plug boot mod, Crossover intakes, polished slides, shimmed needles, #42 pilots, #140 mains, TRP water pump, Faria temp gauge, Napa hose mod, Twin Air power flow kit, Elka front spring kit, Elka Stage 3 rear, Fasst Flex handlebars, Rox risers and dash, ODI grips, Streamline steering stabilizer, PRM grab bar, aluminum skids, Renegade footpegs, Black Rock wheels, Kenda Bear Claw HTR's
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post #9 of 11 Old 03-31-2011, 07:02 AM Thread Starter
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Ok. Thanks for the advice guys. I just ordered that sensor in the radiator and will report back later (after I get it installed) to let everyone know if that solved my problem.

Thanks again!

2007 KFX 730 (sold)
2004 Twin Peaks 800 (sold)
2003 Prairie 650 (parted out)
2002 Prairie 650 (parted out)

Happy trails...

Last edited by Mikeyboy_esq; 03-31-2011 at 07:26 AM.
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post #10 of 11 Old 04-17-2011, 07:19 AM Thread Starter
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Good news! I replaced the radiator temp sensor switch (this part screws into the side of the radiator) and that fixed my problem. I took my twin peaks for a 31 mile ride on Friday at the Sam Hou. Nat'l Forest and it ran great with no overheating problems. The fan kicks on and off like normal.

Thanks again for everyone's advice above.

Happy trails...

2007 KFX 730 (sold)
2004 Twin Peaks 800 (sold)
2003 Prairie 650 (parted out)
2002 Prairie 650 (parted out)

Happy trails...
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