What is that "Stachu100 Apollo1260" circuit that the fan is attached to? Did that come with the board, or did you order that somewhere?
Got a Apollo 1260 myself, and it doesnt have it. Been planning on adding a fan to it, but havent gotten to it yet. It never got to hot, as I've had an open tower the last 10years.
But planning on reviving the whole amiga in a A1200 vanilla box, so will be needing a fan now.