WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
Align the hood rear weatherstrip to the holes in the cowl under the air inlet grille.
Fig 1: View Of Hood Rear Weatherstrip
Courtesy of GENERAL MOTORS CORP.
Install the push-in retainers to the hood rear weatherstrip.