My three way fridge is 23 years old, it has had a new 240v element and thermocouple fitted, obviously new jets but it has been running in this heatwave for the last week at 4-5c, the top vent is in the full sun from 2pm but I did fit 3 fans on the top vent quite a few years ago, I have had to use it for a few weeks because of a problem with one of the fridges in the house (we need two because my MIL needs totally different food stuff than we do

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The freezer compartment is at -14 so ice cubes/ice cream is readily available, I might fit a compressor fridge when we start using the van again but I have never had a problem with mine