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09-04-2011, 09:40 AM
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ATV Enthusiast
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Member #13987
Join Date: Apr 2011
Location: Alabama
Posts: 62
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Fan stays running when key is off
I have a 2005 Polaris Sportsman 500 HO. Last night i was riding and the display said it was running hot. I cut it off and the fan continues to run but very slowly. It's not running fast like it does when it is actually cooling it down. Is there a relay that might be bad or does anyone have an idea of what it might be? Can i wire the fan to a toggle switch and just run it all the time when I'm riding? Where is the relay and the temp sensor on the motor?
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09-04-2011, 11:55 AM
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ATV Enthusiast
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Member #13987
Join Date: Apr 2011
Location: Alabama
Posts: 62
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I ran some wires to the on/off switch on the handlebar. I can use that to cut it on and off. Anyone know if this will be okay?
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09-05-2011, 07:35 AM
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ATV Enthusiast
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Member #13987
Join Date: Apr 2011
Location: Alabama
Posts: 62
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Anyone???
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09-06-2011, 07:48 AM
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ATV Enthusiast
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Member #16605
Join Date: Jul 2011
Location: Brookville, PA
Posts: 31
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I have an '08 400. I know if the fan is running on my fourwheeler, and if the key is left on and the red engine switch is turned to off, the fan will continue to run until the engine cools down. If the switch and key are off, the fan shuts off. Not sure if this helps or answers your question, but hope it helps.
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09-06-2011, 09:41 AM
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ATV Enthusiast
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Member #13987
Join Date: Apr 2011
Location: Alabama
Posts: 62
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It ended up being the ECM going bad. I called the local shop and it was part of the ECM recall. I have to take it to them tomorrow and they will put a new one on.
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09-06-2011, 12:20 PM
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Polaris ATV Junkie!
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Member #14376
Join Date: Apr 2011
Location: Colorado
Posts: 1,025
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Quote:
Originally Posted by justinmiller930
I have an '08 400. I know if the fan is running on my fourwheeler, and if the key is left on and the red engine switch is turned to off, the fan will continue to run until the engine cools down. If the switch and key are off, the fan shuts off. Not sure if this helps or answers your question, but hope it helps.
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How does the engine cool down with just the fan running blowing air through the radiator? This is a feature that makes no sense. Without the coolant circulating all that is cooling off is the radiator. 
__________________
'11 XP 850 EPS, Pitbull Rockers on STI HD2 Wheels, Warn XT25, Full Ricochet skid plate protection
'09 Sportsman 500, 26" Maxxis Bighorns, Polaris 2,500 lb. winch, Cycle Country plow
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09-06-2011, 12:25 PM
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ATV Enthusiast
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Member #13987
Join Date: Apr 2011
Location: Alabama
Posts: 62
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Bobx2, you're right. you are supposed to leave it running while the fan is on. If you turn it off and turn just the key on it is cooling the radiator and the water inside it but not the motor since it is not circulating, i always leave the atv running until the fan cuts off then cut the ATV off
Last edited by Michael0641; 09-06-2011 at 12:27 PM.
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09-06-2011, 05:00 PM
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Polaris ATV Junkie!
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Member #7294
Join Date: Sep 2010
Location: Wisconsin
Posts: 862
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I had the same experience with my Son In Laws 05 500HO, dealer changed ECM for a recall and problem solved.
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09-06-2011, 10:40 PM
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ATV Enthusiast
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Member #16947
Join Date: Jul 2011
Location: Sarasota, Florida
Posts: 73
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I had something very similar just happen to my 06 500. It would come on as soon as the key would turn on, then sometimes just not come on at all. I heard from buddies of mine that most likely it was the ecm.. So I just wired it directly to the headlights, turn on the low beams, I have a fan.. Simple and cheap fix for the time being until I find a cheap used ecm.
__________________
2006 Sportsman 500 EFI
-28" Outlaws, Rad relocate, QSC kit, snorkeled, ODI grips, 4 speaker stereo.
2005 Yamaha Grizzly 686 BBK & Mudbuster cam
-28" Outlaws, Rad relocated, Snorkels, Exhaust snorkel, fan over ride switch, clutch kit
2009 Polaris RZR LE--27" Mudzillas, snorkels
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