2008 KK Liberty w/stock radiator.

On the radiator, the fan is still spinning but wiring harness on left side (when viewed from front bumper) is hanging loose and the plug looks busted.

What's this control if not the fan? I found it last night but my wife took it to work while I was sleeping!

Do I need to tell her not to drive it home?

I don't want her to end up stranded (or to blow my head gasket.)