What feature should the defroster have during pre-trip inspections?

The defroster is an essential component of the vehicle’s heating and ventilation system, particularly in ensuring clear visibility for the driver. During a pre-trip inspection, it is critical that the defroster is functional and capable of blowing air onto the windshield and windows. This feature helps prevent fogging and ensures that condensation does not obstruct the driver’s view. A properly working defroster enhances safety by allowing the driver to maintain visibility under various weather conditions, such as rain or humid environments.

Keeping the defroster operating as intended contributes to overall vehicle safety, as it supports the driver's ability to react to road conditions and maintain awareness of their surroundings. Other options do not align with the functional and safety requirements for a vehicle's defroster during pre-trip inspections.