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I installed a second fan near the top or my refrigerator that runs on 110 volts . I installed a switch on the lower vent. I run the fan nearly all the time. I have no problem with maintaining a 42 degree ( and usually lower, in the high 30's) temperature.
The fan plugs into the 100 volt outlet in the refrigerator compartment--the same outlet that the refrigerator plugs into.
I decided not to waste my time messing with the thermistors.
I am not sure how much the primary, factory DC fan runs, but before the second fan was added I often had trouble getting below 45 degrees. My refrigerator gets so cold that when I travel for , say , 6 hours the temperature does not rise much--but I also run the unit on propane occasionally when underway.
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