At my wits end!!!! I can ride my rhino 20-30 mph for extended periods. slow down and do 4-5 mph and it does not get hot. Slow down and do 4-5 mph for several minutes no issue.. I let it idle while I went in for 10 minute came back out temp light is on and you can hear water boiling and steam but my cooling fan is not on. Cleaned the radiator really good several days ago. Thought I had this beat. HELP!!!!!!!!!!!