What could indicate a malfunctioning blower motor?

A malfunctioning blower motor can be indicated by inconsistent airflow or unusual noises during operation. When the blower motor is working properly, it should deliver a steady flow of air without variance. If there are fluctuations in airflow—such as the air becoming weak or suddenly stopping altogether—it suggests that something is wrong with the blower motor. Unusual noises, such as grinding or squealing, may also indicate mechanical failure or issues like worn bearings, which can negatively affect its performance.

This option highlights clear signs of failure, making it an essential point of observation for maintenance and troubleshooting. The other choices do not reflect signs of distress or malfunction in the same obvious way, focusing instead on stable conditions or routine practices that do not reveal issues with the blower motor.