How do you adjust headlights on 2005 Chevy Express van?

To adjust the headlights on a 2005 Chevy Express van, first park the van on a level surface about 25 feet away from a wall. Turn on the headlights and mark the center of the light beam on the wall with tape. Using a flathead screwdriver, adjust the horizontal and vertical screws located on the headlight assembly until the beams are aligned with the tape marks. Ensure the beams are level and aimed slightly downward to avoid blinding oncoming drivers.