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The sensor operates the ground circut for the relay that operates the fan, so first you'll have to determine which of the two relays mentioned earlier isn't associated with the AC.
Wth a cold engine, turn on the key and turn on the AC. Unplug one of the relays and if the fan quits, that's the one, if it doesn't, then it's the other.
You'll need to disconnect the power supply wire from the relay plug and replace it with a wire from the coil positive terminal. (the coil only gets power when the key is on)
Net result is the sensor will function as normal, but the fan will only come on if (1) the ignition is on and (2) the sensor is telling it too.
The AC function for the fan will still work as normal regardless.
Or, determine which relay is the one that operates via the sensor as described above and just disconnect it period.
In that configuration the fan won't come on at all unless the AC is turned on.
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