The rear air duct on the floor for the B-post vent

Remove the seat from the car. See Lifting the front seats in and out

Remove the rear sill guard. See The rear sill trim panel

Remove the B-post panel. See Panel, B-post, replacing

Fig 1: Identifying Center Console Duct And Upper Mounting

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fold the rear carpet out of the way if necessary.

Pull off the air duct.

Installation 

• Install in reverse order.