My Pathfinder had 35K miles and I took it in to Nissan for an oil change and a Transmission Flush on 4/9. Yesterday I lifted the hood and found this part up near the cowling. It looks like some sort of plug as it has an o-ring on the round part. Rectangle part looks like an electrical cover. Tried blowing into it and no airflow. Does anyone know what this is and where it goes?