i have a 91 2.6 190e. is the coolant temp switch in the radiator? i know the a/c cutout swx is blue and on top of the block, but i can't find the regular one that turns the fans on in traffic (100c). also, can anyone who has done the resistor mod to turn them on at lower temps give me a how-to on it? where to connect the resistor, what value, etc. thanks