your fridge doesn't "run". you probably heard the fan from the converter.
RV fridges/freezer are absorption cooled, not compressor cooled like your home's fridge. that's why the sealing is so tight.
also, it takes hours for a fridge to cool by 120v and even longer on 12v.
propane is much faster but even on a popup's fridge, it'll take hours to cool down.
you need to turn the 12v switch off.
and Zoe the Wonder Dog(R.I.P.)
'07 Roo 23SS pushing an '07 Chevy Avalanche
Equalizer WDH and Prodigy BC