Impala V8-5.3L (2008)
4. Install the screw (1) to the actuator (2) located at the front of each window track.
Tighten the screws to 2 N.m (18 lb in).
5. Power the sunroof window tracks to the close position.
6. Install sunroof window.
7. Verify that the spring action of the sunroof air deflector is operating.
8. Close the sunroof window.