Gas powered absorption fridges need two, maybe three things to work.
[li]They have to contain the appropriate amount of refrigerant flowing through the system.[/li]
[li]They need a good, clean burning flame to create the right amount of heat.[/li]
[li]And there has to be good airflow over the back of the fridge where the cooling fins are. If you block off any air vents that prevents airflow the fridge wont cool.[/li]
[li]Actually, make that four, as the fridge also needs to be level.[/li]
An easy DIY modification is to use old computer fans to expel hot air trapped in that compartment area behind the fridge and the outside of the motorhome or caravan. You can either use these fans to draw in fresh cool air from under the caravan or to push air out through any vents provided by the motorhome manufacturer.
It is often said that gas fridges work best in ambient temperatures of less than 30 degrees.
Of the portable fridge freezer, I believe that 7-year compressor warranty offered by Snowmaster is a market best. I see that Mobi Lodge are specifying this fridge.
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