On a ride saturday, got stuck (that's a whole other story), but as I'm working the bike it overheats on me, radiator fan won't come on. Gotta let it cool off. Same thing happened later on, get stuck, working the bike, engine temp light comes on no fan action. Shut it down let it cool crank it back up get back to riding.
Then oddly enough later on, just sitting there idling on a drink break, fan kicks on for a few minutes and cycles off. Does it again later in the day. In other words, resumes "normal" operation.
So, that tells me the fan circuit is working, but somewhere there's an intermittent issue. Any ideas where to focus my attention?