What is a common cause of boat engine overheating?

A clogged cooling system is a common cause of boat engine overheating because the cooling system is responsible for maintaining the appropriate operating temperature of the engine. When debris, sediment, or corrosion build-up obstructs the flow of coolant, the engine cannot effectively dissipate heat. This buildup inhibits the circulation of water, which is critical for absorbing heat from the engine and transferring it away. As a result, the engine temperature rises beyond safe limits, leading to potential damage or complete failure.

While other factors such as low fuel levels, excessive passenger load, and battery issues can affect boat operation, they do not directly impact the cooling system’s function. Low fuel may cause engine performance issues, too many passengers can affect stability and performance, and an old battery primarily influences electrical systems rather than engine temperature control. Thus, the cooling system's integrity is crucial for preventing overheating.