ok, so let me see if I got this right, you want to be able to turn on your fans remotely? or will a switch in the car be fine? I can give you a wiring diagram for a HI/LO fan switch that would work even with the car off, if that's what you are looking for. As far as remote that's a bit more complicated.

But you really do need the electric water pump to cool the water in the engine.