My kubota tractor has been getting hot. I am diligent to keep grass and seeds blown out of the screen and radiator. However, I got to looking and there was a ton of dirt/dust packed in the fans of the radiator. After presoaking and power washing it is running much cooler. Caution: on my RTV, I think I was a bit aggressive with the power washer and bent too many of the little fan edges down. I will go thru the tedious task of opening them up one at a time.
Temp gauge on my RTV900 always runs close to the Hot side, but never crosses into the red zone. It always has done that. Even under heavy work conditions, it never gets to the red zone. But it sure gets my attention.