An air handling system for a heating, ventilation, and air conditioning system of a motor vehicle includes a conduit configured to convey air from the air handling system to a vent of the air handling system. A control door is rotatably disposed in the conduit. The control door selectively rotates between a first position and a second position. The first position blocks passage of the air flowing through the conduit. The second position blocks passage of the air flowing through a first portion of the conduit and allows the air to flow through a second portion of the conduit. A control feature is disposed in the second portion of the conduit to control at least one of a volumetric flow rate and a pressure of the air flowing through the second portion.

An air handling system for a heating, ventilation, and air conditioning system of a motor vehicle includes a conduit configured to convey air from the air handling system to a vent of the air handling system. A control door is rotatably disposed in the conduit. The control door selectively rotates between a first position and a second position. The first position blocks passage of the air flowing through the conduit. The second position blocks passage of the air flowing through a first portion of the conduit and allows the air to flow through a second portion of the conduit. A control feature is disposed in the second portion of the conduit to control at least one of a volumetric flow rate and a pressure of the air flowing through the second portion.

The front structure of a vehicle includes a drain, provided below a cowl grille, that forms a closed cross-section in cooperation with the cowl grille, in which the drain has flow path portions that extend in the vehicle width direction and serve as paths through which water flows, the flow path portion has air speed reduction portions that reduce the flow speed of air flowing through the flow path portion in the region ranging from the position that overlaps with an outside air introduction hole of the cowl grille in the vehicle width direction to an air inlet of a dash panel.

The front structure of a vehicle includes a drain, provided below a cowl grille, that forms a closed cross-section in cooperation with the cowl grille, in which the drain has flow path portions that extend in the vehicle width direction and serve as paths through which water flows, the flow path portion has air speed reduction portions that reduce the flow speed of air flowing through the flow path portion in the region ranging from the position that overlaps with an outside air introduction hole of the cowl grille in the vehicle width direction to an air inlet of a dash panel.

Disclosed embodiments include airflow systems, vehicles, and controllers of airflow units. An illustrative airflow system of a vehicle includes an airflow inlet duct, an airflow intake duct, an air intake door, and an airflow unit. The airflow inlet duct is adapted to draw ambient air. The airflow intake duct is adapted to receive airflow from the airflow inlet duct. The air intake door is positioned therebetween. The airflow unit includes a controller configured to close the air intake door and seal off the air intake duct from the airflow inlet duct in response to receipt of at least one signal indicating at least one condition chosen from 1) a presence of water in the airflow inlet duct, 2) a hood of the vehicle being in an open condition, 3) a presence of rain received from a precipitation sensor, and 4) activation of a predetermined speed setting of a windshield wiper.

Disclosed embodiments include airflow systems, vehicles, and controllers of airflow units. An illustrative airflow system of a vehicle includes an airflow inlet duct, an airflow intake duct, an air intake door, and an airflow unit. The airflow inlet duct is adapted to draw ambient air. The airflow intake duct is adapted to receive airflow from the airflow inlet duct. The air intake door is positioned therebetween. The airflow unit includes a controller configured to close the air intake door and seal off the air intake duct from the airflow inlet duct in response to receipt of at least one signal indicating at least one condition chosen from 1) a presence of water in the airflow inlet duct, 2) a hood of the vehicle being in an open condition, 3) a presence of rain received from a precipitation sensor, and 4) activation of a predetermined speed setting of a windshield wiper.

An air/water separator drain assembly is provided in a vehicle. The assembly includes a first opening (HVAC intake) beneath a cowl through which air proceeds for use in an environmental control system of the vehicle. A second opening or main drain opening is provided for draining water from the cowl in a first direction. A channel is disposed adjacent the drain opening for collecting water from the cowl. Auxiliary openings in the channel are smaller than the drain opening for removing water from the channel and from adjacent the drain opening.

An air/water separator drain assembly is provided in a vehicle. The assembly includes a first opening (HVAC intake) beneath a cowl through which air proceeds for use in an environmental control system of the vehicle. A second opening or main drain opening is provided for draining water from the cowl in a first direction. A channel is disposed adjacent the drain opening for collecting water from the cowl. Auxiliary openings in the channel are smaller than the drain opening for removing water from the channel and from adjacent the drain opening.

A resin cowl grille is provided to cover an upper portion of a cowl box. The cowl grille includes an upper wall portion and a front wall portion separated from the upper wall portion and provided with a bending promotion portion for inducing bending deformation upon action of load from above. The front wall portion includes a body portion and attachment piece portions extending backward from the body portion and fastened to a front portion of the upper wall portion. A weak portion for load in an upper-to-lower direction is formed by the attachment piece portion.

A resin cowl grille is provided to cover an upper portion of a cowl box. The cowl grille includes an upper wall portion and a front wall portion separated from the upper wall portion and provided with a bending promotion portion for inducing bending deformation upon action of load from above. The front wall portion includes a body portion and attachment piece portions extending backward from the body portion and fastened to a front portion of the upper wall portion. A weak portion for load in an upper-to-lower direction is formed by the attachment piece portion.