perfect!
mine is the same even in 100* temps
I also use a fan over ride switch and it stays cool in slow riding
Keeps the temps down below 180

 

That's what my 900 does.

 

Ok so I am fine then?

 

Your RZR is fine. What you're describing is normal. No fan override switch or special coolant is required. Provided your coolant level is good (it does slowly evaporate), your radiator is clear, and your fan is kicking on and off, you have nothing to worry about. Focus on the ride and stop watching the temp! LOL

 

No. But your RZR is.

 

Good one!😆

 

Mostly.

What you have described is exactly the behavior of the cooling system. However, it's also one closing in on the heat exchange capability of the radiator. The thermostat will stay closed until 180, begin to (slowly) open and ideally reach an equilibrium point and stabilize.

However, if the radiator coolant begins to heat up the engine will slowly gain heat. in response the thermostat opens further. If the cycle keeps happening (it's a dynamic constant adjustment) at some point it's clear the radiator temperature isn't cool enough to reduce the engine heat (which is why the engine temp keeps rising despite the thermostat continuing to open more and more).

What happens then is the thermostat is fully open at roughly 203f. I don't know your machine, but most of them have a "fan on" command that's about 205f, wiht a "fan off" command about 195f. The fan forces more air through the radiator, the coolant temp drops, and the engine begins to cool down.

Wash rinse, and repeat. Exactly what you're seeing.

And there isn't anything wrong with the fan being needed. You were after all going slowly, so it had no natural air flow. That's exactly the fan's job: replace air flow at slow speed.

However, you needed the fan doing gentle riding on an 80 degree day? Personally that would drive me nuts and I'd be increasing my native cooling capacity. Mind you there isn't anything "wrong" with what's it's doing. But personally I'd be:

Washing my radiator (from the back)
Replacing my coolant with G-05 mixed to 40% anti-freeze and 60% RO water.
Adding in Rislone's "Hyper-Cool" while i was refilling it.
Following the directions for your machine re: air bubble burp.

Why? Because what the hell is it gonna do when you're towing a buddy home on a 95f day? Melt? Not on my ass anyway.

Let me know if you need to know more about why the coolant combination I've explained.

 

Mostly.

What you have described is exactly the behavior of the cooling system. However, it's also one closing in on the heat exchange capability of the radiator. The thermostat will stay closed until 180, begin to (slowly) open and ideally reach an equilibrium point and stabilize.

However, if the radiator coolant begins to heat up the engine will slowly gain heat. in response the thermostat opens further. If the cycle keeps happening (it's a dynamic constant adjustment) at some point it's clear the radiator temperature isn't cool enough to reduce the engine heat (which is why the engine temp keeps rising despite the thermostat continuing to open more and more).

What happens then is the thermostat is fully open at roughly 203f. I don't know your machine, but most of them have a "fan on" command that's about 205f, wiht a "fan off" command about 195f. The fan forces more air through the radiator, the coolant temp drops, and the engine begins to cool down.

Wash rinse, and repeat. Exactly what you're seeing.

And there isn't anything wrong with the fan being needed. You were after all going slowly, so it had no natural air flow. That's exactly the fan's job: replace air flow at slow speed.

However, you needed the fan doing gentle riding on an 80 degree day? Personally that would drive me nuts and I'd be increasing my native cooling capacity. Mind you there isn't anything "wrong" with what's it's doing. But personally I'd be:

Washing my radiator (from the back)
Replacing my coolant with G-05 mixed to 40% anti-freeze and 60% RO water.
Adding in Rislone's "Hyper-Cool" while i was refilling it.
Following the directions for your machine re: air bubble burp.

Why? Because what the hell is it gonna do when you're towing a buddy home on a 95f day? Melt? Not on my ass anyway.

Let me know if you need to know more about why the coolant combination I've explained.

Just went out for a ride and it seemed to be fine it was not fluctuating that much it would go up to 190 when I was driving slow and then 177-180 when driving fast (40-45hph) So I think it is fine, May add a fan over ride switch and maybe some of the coolant like what you are talking about. And also why the mixing dose it keep the motor cooler? If you could explain that would be awesome! Also I figured out it was like 85 - 90 degrees today, Thought it felt hotter then 80...

 

 

Thanks!

 

Hello guys! So I have a 2012 Polaris RZR 900. It seems to over heat quite quickly and I mean while we are driving it’s running around 180-190, stopping for 2 minutes it overheats.. and will not go! The fan kicks on but it will not cool down. I have shut it off for an hour and limped it on a trailer to tow it home
Any advice would be greatly appreciated!!

 

What do you mean by "while we are driving it’s running around 180-190, stopping for 2 minutes it overheats"?
Like dose it just all of a sudden shoot up to what ever over heating temp is or dose it slowly get up to over heating temp?

 

Yes it shot up to over heating real fast! We actually had to shut it off to let it cools down. Drove it a couple more miles after it cooled down for 15 min. But then without stopping it shot up again that’s when it refused to go any further. She died and would not restart for me. Ended up walking a few miles til someone picked me up and got me home to get pick up and trailer got back to load it and it barely started and just limped up the trailer (she had nothing left in her) very little power

 

What temp does it go to?
It goes in limp mode?
Any fault codes?
Did it do it before this ride?
Did you do anything prior?

 

Did the engine / exhaust feel super hot?
If it is not as hot as it's saying it could be the temperature sensor that is bad.
I could be wrong I don't know much about the cooling system.

 

Did the engine / exhaust feel super hot?
If it is not as hot as it's saying it could be the coolant temperature sensor that is bad.
I could be wrong I don't know much about the cooling system.

It all around felt HOT. Honestly it’s been a few months since I drove it. I was feeling very discouraged and didn’t want to mess with it for a while I’ve already gotten the motor replaced after a mechanic told me that that is what it needed. My third ride out it started doing that. I’ll put it back together and take her for another spin that way I’ll know the exact numbers and have the information more fresh in my mind.

 

What is the temp it was going to?
Sounds more than an over heating problem
Your mechanic replaced the motor and then it started over heating?
Put it back together?
this is so confusing

 

Did you break your right foot??? This isn't like the "Austin Evil Knievel " we know.
Wishing you a "Speedy" recovery. 🤣

 

😁

 

Sounds like the cooling system needs burped. See shop manual.

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