These are the wires (tails) that are jumped to activate the aux fans at low speed.


The fans operate at low speed when the sensor in the A/C dryer determines that extra cooling air is required to flow across the condenser in front of the radiator. If you are low on AC gas then the sensor will not operate correctly and the fans will not engage when required.

There is a sensor on the engine block that engages the aux fans to high speed. The fans should come in when the temperature reaches around 120 degrees and then shut off again when the temperature is reduced to 100 degrees.

There is a controlling relay near the fuse array that activates from the sensors to engage the fans. If shorting the AC sensor tails does not cause the fans to operate I would be looking at the relay.