Electric fan setups

[Ivan141]

You're mistaken Mux,
The relay will only cut power to the fan when it is energized, meaning you need the switching circuit to keep it off. If you would not have a relay in the power supply it would keep on running indefinately. The relay in the pic above is Normally Closed (NC), so the fan only works when the relay is at rest (no switching current).
The nature of this circuit makes adding a delay switch pretty damn difficult. If it where a normally open relay things would be a lot easier. I've read that some hyundai thermoswitches wil fit the toyota housing and work that way, then you could simply add a nicely sized capacitor to the switching circuit.. Might be a solution, though I dont see the point really...the viscous fan doesnt do anything after shutting off either, and 4age's reach respectable ages. I'm going to use a pushing fan by the way, so this effect would be negligable in my setup.