I found the answer to my question. The black / brown wire coming from the high speed connection at the radiator sensor was broken behind the drivers side head light. Once I repaired this I can now jumper the connector @ the sensor and the high speed fan comes on!!! My problem is still not fixed. The car runs right past normal operating temp all the way to HOT and the high speed fan does not come on. (this is with A/C on & stuck in traffic) I replaced the sensor & the car still over heats. I tested the sensor in "boiling water" and both high and low work. When I put the new sensor on the car neither high or low indicate a short when the temp is getting hot. When I jumper the sensor connector so the high speed fan comes on, the temperature gores back to normal range. So....next question...is it possible there is any air pocket in my radiator or the coolant is not circulating in this chamber? Antifreeze comes out when I remove the sensor.