Those fans are primarily to assist the defroster... It's a large windshield to keep clear without them when needed. Certainly can be used to cool driver/passenger, but when you find you need them on the windshield, it might not be the most convenient time to stand up and turn them...
Power typically requires ignition on... There may be a switch at base of the fan as well (if there is just leave that one on for future) then should work from dash mounted switches.
If not, time to check fuses, and see if you have 12v to the switches and then to the fans.... Unlikely both fans would be bad, but anything is possible.
On my 'project list' - I want to be able to easily use these when parked for additional interior air circulation.... Without key in ignition. Thinking to add a coach power source via diode (the type used in toad wiring kits) to allow it to draw off coach batteries when parked. Could just change to an "always on" chassis supply, but risks running down chassis battery when boondocking which is when I would be most likely to use them.
Not yet retired...
Florida (Michigan transplant)
2014 Hurricane 32A
2000 Infinity (previous)