I've had the same experience as vtech007.
After my fan rattled all of last year, I decided to replace it this winter. I don't have ECMSpy (hoping to remedy lacking skills in that area soon) and had to make sure I bench tested it, and hooked it up pretty securely.
At the same time, I added the Right SIde Air Scoop (XB12Ss). Well, the scoop kept me cool up until the only 80+ degree day we had here. Fan usually came on for a minute or two when I stopped the bike. When I didn't hear the fan come on all through Spring, I began to get a little worried, but it was pretty cool here in the NW. It wasn't until the first 80+ degree day that I decided to ride the hell out of it and see if I had a working fan. Sure enough, got home, came on for a minute (no rattles, awesome...)
Right side air scoop is a ridiculously impactful mod. Granted it isn't that hot yet, I know last year the fan would come on often in the Spring and all Summer long - which is the reason I decided to replace the damn rattling thing.