Thanks jimclemjr I'll take that into consideration but I may be looking at a water pump issue. I drained my coolant system again and pulled my thermostat, it was stuck open again. Not sure why these thermostats are failing, so in a separate thread on this forum I'm looking for a better constructed aftermarket thermostat, if you know of one please advise.
So back to the water pump theory, during my first thermostat replacement I really went over every inch of the coolant system. Stated in a earlier post, I bought this Rhino used, so you never really know what people do to band aid previous problems. So looking at the water pump area, the tube that exits the bottom of the water pump was tucked inside the under carriage plate (not exiting the hole in the undercarriage like it should), when I located the end of the tube it had a large wood screw plugging the end of the tube. Being somewhat new to the mechanics of a side-by-side, I really didn't know the repercussions of this and why it was done. So I removed the screw and made sure the tube exited the frame. I then replaced the first failed thermostat thinking all along that the thermostat WAS my only problem. After the overheating problem persisted, I started reading more online and in my service manual and realized at that point why someone would intentially clog the hose with a screw. Also during this time, I kept having to put Engine Ice in the reservoir and when I would check the radiator when it cooled off, it would always be low of coolant. So, I am almost certain that the water pump seal is gone causing my issues. I've ordered all new working parts for the water pump and plan to tear this bad boy down this weekend, if they come in. I still would like to find another brand of thermostat, because I feel that these should not be failing like they have.