As mentioned, those fans are primarily setup from the factory for defogging the windshield, and they only work with the ignition on.
I'm sure you checked the fuse panel already. And, the fans themselves might have switches on them.
I'd call your Thor concierge and ask for a wiring diagram for your floorplan to be emailed to you. Also, ask exactly how the fans are wired. A simple wire nut may have fallen off somewhere, (that's where other manufacturer's brag about their soldered connections).
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