I finally got around to making this a reality. It is pretty easy and straight-forward, provided you can do simple wiring/circuitry. I used a Mark VIII fan; I would not recommend it for this, as it takes too much modification to make it fit. It has an 18" blade, which alone is almost as tall as the radiator, but is know to be one of the most powerful electric fans out there. It moves over 4000CFM, some claim closer to 4500CFM.
My recommendation is a Ford Taurus 3.8L fan. It is almost as potent as the Mark VIII fan, but uses a 16" blade and fits perfectly on the radiator. I would have done this, had the Taurus fan I pulled not been bad. Anyone that does anything with the Fox body Mustangs is probably familiar with this upgrade, and it is only different by being easier, as the fan control is already built in to the vehicle!
On the stock fan there are four wires. Two go to each fan. The white and black wires are all that are needed for a single fan setup. I am not certain how the stock fan settings would work with this, as I have the fan settings adjusted to push only the "high" fan when needed. This also allows for the fan to be run after the engine is shut off, again a setting within the computer.
Removing the stock fan is simple. From there, you can install the fan however you prefer. I would use the radiator mounting zip-ties that are available from Summit (and probably other places) that are designed to run through the radiator, using "feet" that do not damage the cooling fins. Again, with the fan I used I had a lot more work. Then it is just a matter of wiring in the new fan with a 75A relay. I aquired mine from ebay, along with a 40A circuit breaker in the power line which is just like using a fuse on any other electrical component. it is important to have your electrical system up to snuff, as this is an increased load on the system. I have the alternator rewired, which I am sure helps, although a maintained stock system should be adequate.
I definitely consider it a worthwhile upgrade if your modifications start heating things up under the hood. I am a prime example, as the 3.1" pulley makes a lot more heat and the FMHE "blocks" the entire radiator. This cools emmensely better then the stock fan. Before I could not keep the coolant stable under light operating conditions on the highway. With the A/C on and the temperature above 90º, the coolant would slowly work its way up above 210º, and getting into the throttle would run it even higher, but the fan could not cool it back down. This is with a 180º thermostat. Now the coolant will not get above 190º given the same conditions, and will only slowly climb with more spirited driving. I think with a coolant flush, cleaning the radiator and engine bay a little, and Water Wetter I can keep the engine at the desired operating temperature.
