Abstract: A cowl vent for an over-the-road tractor that assists in the evacuation of heated air from the engine bay and an increase in airflow through the engine bay of an over-the-road tractor. Vents are placed in the cowl zone of the truck cab generally below the A-pillar of the cab. The cowl vent is made up of a flange having a leading edge lip and a deflector mounted spaced apart from the lip to create a first port for the exhaust of heated engine bay air. A second port is formed by the deflector at a trailing area of the deflector and heated air will also exit out this second port as well as out the first port.