I would give it a go. I have had great luck with an electric fan conversion in my Toyota. I don't know why everyone seems to think that adding it is going to tax your charging system to the max. The only scenario where I see you doing that is if you are running everything at once IMHO. How often you do that?

My stock Toyota alternator only puts out 40 amps and I even have an underdrive crank pulley, so that in turn spins the alternator slower than it used to. No problems with my charging system to date. The Black Magic fan I have on there draws more than 20 amps.

I have a 14 inch Flex-a-Lite Syclone fan waiting at home for me to install on my 240D. I'm going to install it with a Painless Wiring adjustable theromstat. That isn't exactly the cheapest route to go, but you get what you pay for. I'll let you know how it goes and will post pics.

On my Toyota I used to have an off the shelf cheapo electric fan installed. I wired it up using a fog light relay kit. It was manual but it never gave me problems and I ran that for years. Good luck!!

__________________
1977 Mercedes 240D... 4 speed manual... soon to be host to a lot of mods..

1984 Toyota 4x4.. Weber 32/36 DGEV carb, Offenhauser Dual Port intake manifold, TRD cam, MSD 6A ignition, MSD 8.5 wires, MSD Blaster coil, NWOR Tri-Y header, cat-back exhaust, NHK 3" lift springs, Black Magic electric fan, LC Engineering crank pulley,traction bars, LockRight locker, oil cooler, manual water temp gauge, oil temp gauge, vacuum gauge, and 394,000 miles on the clock with one motor change.