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The aux fan kicks on under two conditions:
Low Speed:
When the a/c high side pressure exceeds a certain value (not sure of exact value)
High Speed:
When engine reaches a certain temp (not sure of exact value)
So if neither condition is met, no fan.
Many people modify the wiring so that the low speed fan comes on when you kick on the a/c or just wire it up so it run all the time.
Another mod is to wire in a resistor on the sensor so that the high speed mode activates sooner than the normal set point
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