bullion 
Refrigeration repair for RV's, I thought about doing this as it is very specialised type of work having big profits.
If you have a shop locally that does this type of repair often they will purchase the cooling unit as pictured below an easy $50.00 to $100.00 depending on size.
This type of refrigeration uses water and ammonia, the ammonia has an affinity for water when mixed this solution resides in a reservoir near the bottom of the unit when heated the ammonia is driven off as a gas. In this phase it seeks out water passing through the cooling coils on its journey.
Once the ammonia gas has been reunited with the water the cycle is repeated until the desired cooling temperature has been reached, a thermostat shuts off the heat source.
Often when an RV reintegration unit has sat for long periods of time the ammonia may separate on its own accord from the water to settle out near the top of the unit as a gas cloud unable to make its return to the water, The owner finding the fridge not working has two choices, have it repaired or buy a new replacement or one that has been refurbished.
If there is no ammonia smell chances are that a simple fix can be made, by removing the fridge from its location then gently turning it upside down is enough to reunite the ammonia with the water making the fridge once again operable.
Long before RV fridges came onto the scene there were domestic fridges that operated via a small kerosene lamp, same type of operation ammonia and water with a source of heat same as the RV fridge we know today.
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