A few questions: When you stop and let it idle, does the fan come on and stay on as the RZR heats up? What did you do to determine that there is no air in the cooling system? When you say "full of water" is that exactly what you mean - no antifreeze just water?

Without the answers I can give you a couple of things/suspicions to look into. First off most of the overheating issues have been caused by air in the system, and it is very difficult and time consuming to get it out. Another possibility is the radiator cap may not be holding pressure any longer. The other items you mentioned are also possible causes.

Mike

 

Yes fan comes on! I jack front of machine up to fill system then I used the bleed screw at thermostat to get rest of air out of system. Which I will check it again. I mean coolant is not low.


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If the fan is spinning as fast as it should, the radiator fins are not clogged with mud and no air in the system, then I would lean toward the water pump not pumping enough, sense you said if you rev it up it would cool off. That sounds like a flow problem. But I would check the thermostat also. Is the fan running when it is flashing hot?

 

No mud In Radiator yes fan running when hot all I have to to is start moving and it stop flashing. Hot


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Sounds like a bad water pump or thermostat

 

Something else to consider, what rpm is it idling at? If idle is too low, water pump wont be turning fast enough either.

 

1000


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That could be a little low, pretty sure it should idle at 1200.

 

If you have access to a infrared thermometer, you could run some heat checks . Might be a faulty sensor ect.
Harbour freight sells them real cheap and seem to work good.

 

Anyway to check sending unit


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Done test and inline temp sensor I installed only showes like 160 to 180


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Did u check close to the thermostat? Only asking since thats where the oem sensor is. If u check very far from there the temps could be alot lower. Especially if the water pump isnt flowing the coolant enough.

 

Flushed system and problem appears to be gone thanks all


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Just for info...here's a post I did on getting all the air out of the coolant system.

It takes a bit of time, but worth the effort.

http://www.rzrforums.net/general-rzr-discussion/127206-coolant.html#post1558399

Pirate

 

Thanks