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03-30-2011, 09:24 PM
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#1
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Super Moderator
Feedback Score: 3 reviews
Join Date: Aug 2003
Location: Conroe, TX
Posts: 8,329
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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
2004 Twin Peaks 700 (sold)
2003 Prairie 650 (parted out)
2002 Prairie 650 (parted out)
Happy trails... 
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03-30-2011, 09:25 PM
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#2
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Senior Member
Feedback Score: 75 reviews
Join Date: Nov 2007
Location: Ky
Posts: 10,964
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Most likely the sensor in the radiator.
__________________
A 4.0 Fu#*ing Liter straight 6, A box full of hollow points and lord willing a GD Twinkie. Gotta enjoy the little things!
2k8 700xX 
2k3 400ex {Wifes}
2k4 V-Force(SOLD) 
2k8 730 V-Force(SOLD) 
2k4 V-Force Roller (SOLD) 
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03-30-2011, 09:33 PM
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#3
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Premium Member
Feedback Score: 9 reviews
Join Date: Jul 2009
Location: QLD Australia
Posts: 3,161
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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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03-30-2011, 09:42 PM
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#4
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Super Moderator
Feedback Score: 3 reviews
Join Date: Aug 2003
Location: Conroe, TX
Posts: 8,329
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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
2004 Twin Peaks 700 (sold)
2003 Prairie 650 (parted out)
2002 Prairie 650 (parted out)
Happy trails...
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03-30-2011, 09:48 PM
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#5
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Premium Member
Feedback Score: 9 reviews
Join Date: Jul 2009
Location: QLD Australia
Posts: 3,161
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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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03-31-2011, 04:02 AM
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#6
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Senior Member
Feedback Score: 0 reviews
Join Date: May 2009
Location: South Central Illinois
Posts: 1,765
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Let us know if the temperature sensor was the culprit.
__________________
2008 Brute Force SRA
VFJ Stage 3 clutch, spidermod, KEBC removed, maroon primary and VFJ #4 secondary springs, Dynatek, spark plug boot mod, Crossover intakes, polished slides, shimmed needles, #42 pilots, #140 mains, Napa hose mod, No Toil Super Flow kit, Elka front spring kit, EPI rear spring, Fly handlebars, Rox risers and dash, ODI grips, Streamline steering stabilizer, PRM grab bar, aluminum skids, Renegade footpegs, Black Rock wheels, Maxxis All traks
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03-31-2011, 04:03 AM
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#7
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Senior Member
Feedback Score: 75 reviews
Join Date: Nov 2007
Location: Ky
Posts: 10,964
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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.
__________________
A 4.0 Fu#*ing Liter straight 6, A box full of hollow points and lord willing a GD Twinkie. Gotta enjoy the little things!
2k8 700xX
2k3 400ex {Wifes}
2k4 V-Force(SOLD)
2k8 730 V-Force(SOLD)
2k4 V-Force Roller (SOLD)
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03-31-2011, 04:08 AM
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#8
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Senior Member
Feedback Score: 0 reviews
Join Date: May 2009
Location: South Central Illinois
Posts: 1,765
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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, spidermod, KEBC removed, maroon primary and VFJ #4 secondary springs, Dynatek, spark plug boot mod, Crossover intakes, polished slides, shimmed needles, #42 pilots, #140 mains, Napa hose mod, No Toil Super Flow kit, Elka front spring kit, EPI rear spring, Fly handlebars, Rox risers and dash, ODI grips, Streamline steering stabilizer, PRM grab bar, aluminum skids, Renegade footpegs, Black Rock wheels, Maxxis All traks
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03-31-2011, 06:02 AM
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#9
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Super Moderator
Feedback Score: 3 reviews
Join Date: Aug 2003
Location: Conroe, TX
Posts: 8,329
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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
2004 Twin Peaks 700 (sold)
2003 Prairie 650 (parted out)
2002 Prairie 650 (parted out)
Happy trails...
Last edited by Mikeyboy_esq; 03-31-2011 at 06:26 AM.
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04-17-2011, 06:19 AM
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#10
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Super Moderator
Feedback Score: 3 reviews
Join Date: Aug 2003
Location: Conroe, TX
Posts: 8,329
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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
2004 Twin Peaks 700 (sold)
2003 Prairie 650 (parted out)
2002 Prairie 650 (parted out)
Happy trails...
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