For service and parts needs, visit your dealer. You will receive genuine GM parts and GM-trained and supported service people.
Genuine GM parts have one of these marks:

California Proposition 65 WarningBody Panel Paint Protector Replacement (VGC)
The paint protective film and vehicle surface temperature should be 13?€“32?°C
(55?€“90?°F) for best results.
Automatic car washes should be avoided for at least 24?€‰hours after the
paint protective film application.
Wipe the vehicle surface with isopropyl alcohol or fl ...
Sunroof Description and Operation (Tilt and Slide)
The Tilt/Slide sunroof consists of a moving glass panel and a manual sunshade.
In the Tilt/Slide sunroof system the rear of the glass tilts up above the roof line
for venting, and slides between the headliner and the roof panel to open fully.
The sunshade is operated by manually pushing or pu ...
Sunroof Window Seal Replacement
Removal Procedure
Remove the sunroof window panel. Refer to Sunroof Window Replacement.
Remove the seal from the window panel frame by pulling the seal away
at one point and continuing around the perimeter of the frame.
Clean around the edge of the inside surf ...