Temp light started coming on in traffic the other day. I thought this was strange, because I had certainly been in hotter traffic in the past. I noticed I hadn't heard or felt the radiator fan come on, but I had earplugs in, and they tend to block that kind of frequency, plus, my horn still worked, and I seem to remember they're on the same fuse.
When I got home I idled the bike until the temp light came on, and peeked at the fan from the back of the bike. I could see it was turning, but not at anywhere near full speed, and as I watched, it was slowly winding down even more, until i could watch the blades go around. There was no "notchiness" whatsoever to this motion, so i have to believe nothing is stuck or seizing.
I'm ready to order another motor from beemerboneyard, but I'd like some confirmation from the experts that there's nothing simple left to check/fix that would save me from buying a new motor.