Sounds Like You Got I Covered...
Sorry I can't help you on the fan project. I have no experience in that area.
There is an antifreeze/coolant that is used without water in a pressureless environment that could solve your problem. It was developed for use in race cars.
Check it out. I heard about it from a member calling himself "Running Too Hot"...
"We drive into the future using only our rearview mirror."
- Marshall McLuhan -
Northern California Wine Country...
"Turbos whistle, grapes wine..."