What is a common cause of an RV's engine overheating?

The choice regarding low coolant levels or a malfunctioning thermostat is accurate because both factors directly impact the engine's ability to regulate its temperature. Coolant, or antifreeze, is essential for absorbing heat from the engine and dissipating it through the radiator. If the coolant levels are low, there may not be sufficient liquid to transfer heat, causing the engine to overheat. Similarly, if the thermostat is malfunctioning, it may fail to open at the appropriate temperature. This can prevent coolant from circulating properly, leading to overheating as the engine fails to cool down effectively.

Other options involve factors that do not significantly influence engine temperature control. High fuel levels have no direct effect on engine temperature, as fuel management primarily impacts combustion efficiency rather than cooling. A malfunctioning radio system does not affect engine operation or cooling systems. Excessive tire pressure relates to tire performance and safety rather than engine operation; while it can cause increased wear and affect fuel efficiency, it does not contribute to overheating issues. Thus, low coolant levels or a malfunctioning thermostat is the most relevant cause of an RV's engine overheating.