When I had the 195RB I used one of these thermostat switches to control the computer fan I'd installed in the exterior fridge vents. It worked quite well.
As for the interior fan - you'd have to be able to tap into the 12v+ for the light prior to the door switch or other mechanism used to control it. That's usually not feasible so running the 12v+ line out the drain tube is the easiest way to deal with this. You can still tap into the ground line for the interior light. I didn't have a exterior drain in the little Norcold N3xx in the 195RB but this is the way the interior fans in the larger N8XC fridge in the ORV are wired.
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TT: 2019 ORV Timber Ridge 23DBS, Blue Ox SwayPro 15K/1500
TV: 2019 Ford F-250 XLT SuperCab LB, 6.2L, 4.30/e-locker, 4x4, 164" WB, RoadActive Suspension, 3216 payload
TV: 2014 RAM 1500 Big Horn CC (Traded in)
TT: 2015 Jay Flight SLX 195RB Baja Edition, Andersen No-Sway (Traded in)
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