To test the heater/defroster during a pre-trip inspection, what should you do?

To test the heater/defroster during a pre-trip inspection, it is crucial to ensure that it activates and blows air as intended. This involves not just turning it on but confirming that the system is functioning and directing airflow appropriately. A simple check of whether it blows air gives you the foundational proof that the system is operational, which is essential for passenger comfort and visibility issues a driver might face during inclement weather.

Checking just the temperature, for instance, does not confirm airflow and could lead to misdiagnosing a malfunction. Leaving it off to save energy neglects the importance of ensuring the system is fully functional before hitting the road. Focusing only on the defroster could overlook potential issues with the heater aspect, which also requires validation for overall climate control in the vehicle.