Never thought I'd even consider doing this, but since my fan clutch has failed in the free-wheeling mode, I might decide to take the plunge. Now I can get another fan clutch at RockAuto for about $40 and solve my problem the easy way, but since I have a Koyo radiator that is about 2" thicker than the stocker, the radiator shroud sits about 1~2" closer to the engine, which makes it a royal PITA to R&R the stock fan and/or fan shroud any time you need access at that end of the engine. So my motivation is to clean up the engine bay, and hopefully improve cooling performance in traffic jam situations.
The Koyo radiator core (finned area) measures 18.625"H X 18.0"W, so I'm thinking any quality 16" diameter e-fan that pulls at least 2500 CFM at the least current draw is what I should get. Options are aftermarket (SPAL, Flex-a-lite, Summit racing, Zirgo, etc), or pick up a new OEM e-fan off of Rockauto for another car that meets the basic spec requirements and includes a shroud that can be adapted to fit.
For controlling the fan, I'm thinking of adapting the stock circuit S5's have to control the auxiliary e-fan, and just removing the aux fan. Here's the circuit:
I figure I would replace the relay with one that is beefy enough to handle the current draw of the fan I select, and run new wiring as well. The question I have is the temperature the stock temp switch kicks on at (207*F) too high?
My temp switch probably needs to be replaced, because the only time I ever hear the aux fan kick on is when the A/C is on, or if I start the car up right after a short heat soak in the summer (e.g., driving with A/C on, stop with temps at around 195 or more, fill up the tank, when you start back up temp is over 215 or so for the first few seconds).