Electric fan setups

[Ivan141]

Okay, I'm planning to convert to an electric fan sometime in the near future, but I'm having a few second thoughts about all the setups I have found on other hachi forums.

First a short explanation of the basic setup, I think most of you already know about it.

I have bought a new water pump, but it's aftermarket, and I'm not sure if it will survive the viscous fan. Now I have nothing against the OEM fan setup, I just want to be able to use cheaper and easier to find waterpumps. Others state that the reduction of rotating mass (and resistance since it displaces air) will make the engine response better.

It is possible to use the AE92 thermostat inlet tube instead of the original ae86 one, the ae92 GTi inlet has a thermo-switch installed in it.

Now this thermo switch is normally closed. meaning it has very little resistance when cold. To use it you need a normally closed relay (toyota 90987-03001 relay). Below a basic schematic, not one I would recommend since it would slowly drain power from the battery to keep the fan off when the car is parked.

To use this circuit without using any power with the ignition off, you would need 2 additional relays. To stick to OEM ae92 wiring, the switching wire should be tapped from the ignition relay, the main power supply should come from the engine main relay. Now here are the few concerns I still have: How much power does an electric fan use? The 3001 relay is rated for 15A, I can imagine a fan drawing larger currents than that.
Second is how will the engine main fuse and relay cope with the additional load? I have tried measuring the resistance of the thermoswitch in boiled water, I couldnt get it higher than 80 ohms myself, this means that the relay would be operated with 200mA when shut off, and 80mA when it is supposed to be working.....

Arghh..let me know if any of you have opinions on this matter..