Has anyone ever experienced overheating on their Polaris Sportsman 500? Water pump is circulating, Thermostat has been replaced, Radiator fan is operational. There is coolant in the radiator and the system has been properly bled. Symptons After a few top end runs, warning light will turn on and there is steam build up in the cooling system (Radiator and Overflow bottle) Any help in this matter will be accepted.