[90FormulaWS6]

take the lead to the coolant temp sensor and hook it up to a ground... that will turn the fan on, to make a switch you lead the line that hooks up to the CTS and hook it up to a switch from your local auto parts place, the other end of the switch will go to a good ground... the way it works through your ECM is when the car gets up to heat, the computer grounds that circuit and turns on the fans, so with the switch you are basically completing the ground on the circuit whenever you want it to ground

i did this on a 91, but i see you have a 96 so this might be different, but as far as i know its the same