An airflow directing assembly and associated method of assembling same, includes an air deflector having a first portion mounted in the vehicle engine compartment rearwardly of the bumper beam and including a separating wall that extends between and segregates a first, upper air flow path from a second, lower air flow path. The airflow directing assembly includes a second, flexible seal portion extending from the air deflector first portion in a direction toward the bumper beam. The flexible seal portion is configured for sliding, sealing engagement with a surface of a vehicle engine compartment component such as the bumper beam to accommodate build variation during vehicle assembly.