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post #1 of 14 (permalink) Old 06-26-2010, 09:10 AM Thread Starter
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500 HO overheating

Sorry, if this has been covered, I am new to the forums and tried searching the existing posts with no luck.

I have a 05 500 sportsman HO. The fan turns on and off properly, I think the coolant is flowing properly due to movement of the fluid in the reservoir. The motor does not seem any hotter than normal, but the display flashes HOT engine. Can anyone point me in the right direction?

Thanks
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post #2 of 14 (permalink) Old 06-26-2010, 09:30 AM
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Take a good look at the front of your radiator. Make sure its clear of dried mud. If the "fins" that make up the radiator are clogged they will not be able to dissipate heat properly. Ive had this happen to me shortly after purchasing my quad after the first good mudding trip.

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post #3 of 14 (permalink) Old 06-26-2010, 09:43 AM Thread Starter
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I cleaned the radiator fins out this morning, because it was a little dirty. It didn't help. I topped the coolant off to. This seemed to make it where I could ride the bike a little longer before the display warning came on. I think it may be a faulty sensor but I am not sure. I don't want to ride it in case I am wrong.
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post #4 of 14 (permalink) Old 06-27-2010, 10:46 AM
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get a temp. sensoring gun and check temps at all heat sensors, radiator at intake and outputand at engine, that should tell u what is goin on!!!!!!!!
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post #5 of 14 (permalink) Old 06-27-2010, 10:49 AM
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and check the thermostat too.
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post #6 of 14 (permalink) Old 06-27-2010, 12:39 PM Thread Starter
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what temps should I be looking for as acceptable and unacceptable?
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post #7 of 14 (permalink) Old 09-12-2010, 05:58 PM
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I have a Polaris 450 Outlaw and the same thing happens to me as well. I have cleaned the radiator until is sterile and still the temp light turns on after a while of riding. Anyone know where to starting looking for a solution?
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post #8 of 14 (permalink) Old 09-12-2010, 06:20 PM
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rear side of fan also.

Quote:
Originally Posted by brody81 View Post
Take a good look at the front of your radiator. Make sure its clear of dried mud.
Take a good look at the rear of the fan and inside the shroud also.
The one I'm working on now looks spotless from the outside, but upon crawling around underneath I noticed this.
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Take care,
Scott Deeter

1998 Scrambler 400 4x4 2 stroke (SOLD)
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post #9 of 14 (permalink) Old 09-14-2010, 12:43 PM
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Sounds like you have a faulty sensor....if the quads not overheating then you can rule out the thermostat unless its just opening enought to let some coolant pass...500's run about 180 to 190 degrees before the fan comes on and will cool down to normal 150 to 160 degrees..is the oveflow bubbling? Are you loosing any coolant? That radiator looks beat...if fins are clogged or bent up you won't get the proper air threw the rad to cool the quad..and that maybe throwing your light on....bad circulation..Muddie49

2009 Polaris 500 HO
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Last edited by MUDDIE49; 09-14-2010 at 12:48 PM.
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post #10 of 14 (permalink) Old 09-14-2010, 04:41 PM
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Most common reaSON FOR OVER HEating is a dirty radiator. It takes a very detailed cleaning to get the proper amount of air flow to prevent over heating.

2005 SP 500
2004 SP 500
2002 SP 500-SOLD
2001 SP 500-TOTALED
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