i'm assuming the fridge is a 3-way fridge.
the slowest way for it to cool, is using the 12v setting.
the second slowest way is to use 120v AC shore power.
the fastest way is to use the propane.
using propane will still take a long time, usually overnight to make sure.
to check if it's working, try it on propane next. otherwise, check the manual for the fridge. should be a troubleshooting section.
or find the model number and go to the manufacturer's website.
and Zoe the Wonder Dog(R.I.P.)
'07 Roo 23SS pushing an '07 Chevy Avalanche
Equalizer WDH and Prodigy BC