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2K views 10 replies 4 participants last post by  rijoh2000 
#1 ·
Hi everyone I need a hand. My 2010 RZR 800 is boiling over at 160 degrees. I've replaced the water pump thermostat radiator cap cleaned and flush the radiator even re did the head gasket. I have days into this problem
 
#4 · (Edited)
Hmmm... I'm probably mistaken but thought the 2008-2010 didn't display the temp on the cluster - it got added in 2011 on up. Where are you seeing the 160 degrees?

As mentioned, air in the system is notorious for causing overheating. A couple other options - there are reports that radiator caps go bad and quit functioning. You can get aftermarket caps like this (make sure you get the model for your year). https://www.dragonfireracing.com/product/858/extreme-duty-radiator-cap-for-rzr-900-800-ace-models

Does your fan kick on at all? Is the engine acting like it's too lean and backfiring? Does your coolant have oil in it or vice versa? If you have modifications to your rzr you might want to consider one of the oversized radiators.
 
#6 ·
It's got a temp sensor. I've spent days trying to bleed it every way possible. I replaced the water pump thermostat and radiator cap prior to this post. I did a year gasket even and still had the same issue. I read the the bleeder can allow air to suck In if they are wore out which mine was so I replaced that and am trying to bleed the system now. It's better then it was so we can hope it's that simple
 
#7 ·
Yes, true they all have a temp sensor that sends to the ECU which tells the fan to come on and off. But on the early model 800's it didn't display on the cluster like they do on the later ones.

It also seems odd that it would boil over at 160 degrees when the boiling point of water is 212 and with antifreeze it would be higher. Just wondering if the sensor, or the display, or something else is off.
 
#8 · (Edited)
Bull. My 2008 50” had a temp display. They ALL did. You just had to toggle to the temp.

And it’s not odd at all. The temp sensor sat in the block where an air bubble could get and not display the true coolant temp causing it to boil over and show a low temp.

And it helps to Raise the front of the RZR up high and massage the coolant tubes as well as doing the bleeder. It’s a PITA but you’ll get it
 
#11 ·
#9 ·
It displays the temp in the cluster. I have used an air lift to suck all the air out and I've also had the front end up to 4 ft off the ground using a cherry picker. This all sounds like it should be simple to do but something doesn't add up. I'll know after work today if I finally got it or not guess we will see
 
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