can someone help me with this i want to rig a switch to turn on my cooling fan AT WILL need help with this anyone know what i need to doto get this to work

Mid-America sells a kit for that very thing. All you have to do is find the fan relays and run an extra wire off the grounding terminal to ground. Then break that ground with your switch(es). Basically, a wire from the ground terminal to the switch and then to a ground. Hope I explained clear enough. It won't affect the computer.

I have cured it I replaced the thermostat with a 180 stat and that seems to have cured the cooling and stalling problems