Which of the following is a common maintenance requirement for RV refrigerators?

Regular cleaning of coils is crucial for the proper functioning of RV refrigerators. Dust and debris can accumulate on the coils, which can hinder the unit's ability to dissipate heat effectively. When the coils are clean, they allow for better heat exchange, which improves the refrigerator's efficiency and can extend its lifespan. This maintenance task not only helps in maintaining the cooling efficiency but also prevents potential overheating issues that could arise from a buildup of grime.

Other practices mentioned, such as yearly replacement of coolant and monthly testing of thermocouples, are typically not required for RV refrigerators, as most models are designed to last without frequent coolant changes, and testing of thermocouples is a more specialized maintenance task not needed on a routine basis. Additionally, while inspections for leaks are important, they don't necessarily need to be conducted weekly; rather, it's more common to perform these checks during periodic maintenance.