Which of the following indicates a problem with the water pump?

A water pump that is not belt-driven raises a potential issue because most water pumps in vehicles, including Class B vehicles, are typically belt-driven. If a water pump is not driven by a belt, it could indicate an incorrect installation or that the pump relies on a different method for operation, which might not be standard for the vehicle type.

Having a water pump that is securely mounted and shows no visible leaks is essential for ensuring that the pump operates effectively without causing coolant loss or overheating. Meanwhile, cleanliness of the water pump is also important as dirt and debris can lead to overheating or damage, but it alone does not indicate the operational status of the pump itself.

Thus, the fact that the water pump is not belt-driven suggests that there may be a deviation from the expected configuration, leading to a potential problem that requires further investigation.