How should the bus's heater and air conditioning be tested?

The most effective way to test the bus's heater and air conditioning is to turn on each system to confirm operation and effectiveness. This direct method allows the inspector to assess whether the systems are functioning properly and efficiently, ensuring that both heating and cooling can reach the desired levels. It helps identify any operational issues, such as a failure to heat or cool sufficiently, that might not be evident through other testing methods.

Observing external vents alone may give an indication of airflow, but it won't provide insight into the performance or temperature regulation of the systems. Checking fuse connections is important for overall system functionality, but it does not test the heater or air conditioning's performance directly. Comparing systems in other buses may provide some context, but it does not substitute for direct testing to evaluate specific performance in the bus being inspected. Therefore, directly operating and assessing each system is the most reliable approach to determine functionality.