We had something like that fan in our B190 - which had no roof vent, only side vents, so it needed every little bit of help it could get. The fan was mounted above the fridge coils somehow, but I don't remember how. I bypassed the thermal switches in favor of just controlling it manually with a switch inside the camper (lighted so I knew when it was on). Between doing that and replacing the door gasket, the fridge worked reasonably well.
Even as much as I struggled with that fridge in hot weather when I first got it, I never saw it get as warm as that did, though. I want to say the warmest I ever saw mine get, on a bad day with a leaking gasket, was around 50 in the fridge compartment. So, I don't think you're dealing with simple overload (unless they had the door open a lot) - I think something is wrong in their setup.
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1995 Airstream Classic 30' Excella 1000
2014 Ram 2500 Crew Cab with Cummins 6.7L Diesel
Sold but not forgotten: 1991 Airstream B190
Sold: 2006 F-250 6.0L Powerstroke Supercab
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