Water impellars and seals are known for going in this machine. If you are using water it is because a seal behind your pump is bad.

 

I don't disagree with any of the posts--I know though on my machine Ive taken the radiator out and soaked it in a cement tub overnight then I flushed it good, inside and out then changed the sensor and replaced the coolant all trying to stop the "condition" to no success, so thats why I posted what I did about getting a gauge BUT if someones got a fix I'd like to hear it. ***One thing to remember NEVER use just straight coolant, to work at its best it must be mixed with water 50/50 or 60/40.

 

thermostat stuck ? Just an idear

 

I don't have a fix... other then the take the fan off and clean the p out of the rad after muddy riding. that's what we do up here after mud events and still overheat sometimes. Polaris needs bigger rad for those twin engines.

Interestingly my 500 fan shroud is different then my 800 and I have no problem with the 500. We all chalk it up to single vs twin cylinder but I'm not convinced that the 500 doesn't allow more air through with the design of the shroud vs the 800.

the 500 attaches at each corner with air flowing through where the fan doesn't cover. the 800 is more like a funnel and the air has to go through ONLY where the fan is???

Any thoughts on cutting away some of that shroud. And is your 700 like that.

Additionally - I can be plowing at 0 degrees, sometimes even 10 below zero and snow flying through the engine and rad and my fan will kick on and run.

Of all times you would think the engine could stay cool enough then.

Looking forward to solutions.

 

My Polaris 700 was doing the same thing yesterday on a Search in Grays Harbor County. The temp outside was around 55-60 and raining, my hot warning came up 5 times during the 10 hour search.

My question is on my 2005 Sportsman the only way I can get the fan to run when the bike is off is to turn off the bike with the STOP/RUN swith and move the swith back to RUN with the key on. Is this normal?

I am going to take a look at my radiator tonight, I am sure it is full of mudd.

Thanks,
Paul Lindemann
South Puget Sound Mobile Search and Rescue
SPSMSAR.org

 

I agree with upnort. I have a 600 that always ran hot and the fan would always kick on sooner then anyone else. I took the radiator out and I was AMAZED at how much crap was stuck in the radiator, even though I always rinsed it off after each ride. I soaked it for hours and used a soft brush to get the junk out. Once it was clean and flushed the radiator, it hardly comes on at all. Good luck and keep on muddin'.

 

Just had to rebuild my motor on my 700 because of a stuck thermostat, so that could be it.