The fans come off a 1997-2001 4.0l cherokee. I grabbed a spare rear wiper switch and switch panel and put it in the right side of the dash(my SE stripper model had a blank panel). The switch is connected to ground and activates a shielding relay(so I don't get a p1691 aux-fan code)that I put in a blank location in the pdc which then activates both the stock e-fan relay and the 2nd e-fan relay that is in another blank pdc spot. That relay get's it's power from a fused wire that I ringed to the pdc b+ post. Without the switch on, the fans will still kick on at 217*.
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