The Door Vent Valve (-1520892-) is mounted inside each front door to allow continuous airflow through the cab while the truck is moving forward. Air hitting the w/s flows down through the wiper valance into the cowl to the Right side where it passes forward through the firewall into the engine bay HVAC box, past the blower & evaporator, then rearward through the firewall out the dash through the door panel louvers, through the door shell interior louvers, through this valve, and out the door rear louvers.

Owner caption March 2021 · Photo 0 of 5000