Stock radiator, actually the whole cooling system is stock apart from the SVT water outlet and I'm using a SVT water temp sensor (SVT has no provision for a head temp sensor like the stock zetec). Resistances of the sensors is identical though.
Fans are on toggle switches, so they come on when I turn them on lol. Which is never as it is now.
I did get it to warm up once. Had to let it idle for about an hour though.
Don't "think outside the box".
There is no box.