yamaha kodiak 450 '04 flashing red reverse light on.
 

kodiak 450 2004 red reverse light on as temp increases on machine, I have a overheating issue, fan not coming on, fan runs when connected directly to battery, water is circulating through machine, thermostat and water pump are operating. This leaves radiator temp sensor in Radiator above hose, am I missing anything else? Is there more than 1 sensor?