[Fulltiming]

If you have all the blueprints and wiring schematics you are a lucky person indeed. Most of us have no wiring schematics and only the one sheet floorplan or on later coaches the one sheet floorplan and elevations plan.

I suspect the fan is a temperature controlled cooling fan for the electronics in the passenger side overhead compartment but since my coach doesn't have a fan in that area, I can't be certain.