Okay everyone, so I have decided to upgrade my cooling system with a Ford Taurus 2 speed electric fan. The question that is I have is how do I control both the low and high speed? I see lots of write ups where they explain how to wire the switch, but where I am getting confused is when I look at the switches, it says "controls two speed fan or two fans". I thought that it would engage the low speed at about 180 degrees, and then at 210 the high would come on by engaging in addition to the low speed. I have found that if both the high and low are engaged together, it runs on low speed only. Does anyone know of a switch that I can stick the probe in the radiator, wire up my fan and have it only engage the high OR low speed? Part numbers or links would be the most helpful. Thanks a lot for all your help.