If its a similar setup as the V8 cars, which I would imagine it is, the manual fan switch just grounds the fan relay instead of the PCM doing it. So if the relays, fuses and fans all work, you should be good to go with that.
So the two leads, high and low fans, can either be combined or wired separately for individual control. Throw a switch and a good ground in the cabin together, and voila success.