Update 5/12/15: talking with the local dealer I confirmed this rig has only one temp sensor on the motor. They have no idea the cause of my fan cycling the way it did; however tonight I cleaned what little dirt was on the radiator and put new antifreeze in it; (I had to put stream water in it to get back to camp). Ran it for about 20 minutes in idle and the fan came on; so I will take it out to Sutton this weekend for a test drive. (My reference to Sutton will only mean something for the south central Alaska members on this forum 