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 WarningFront Air Deflector Replacement
Front Air Deflector Replacement
Callout
Component Name
Preliminary Procedure
Remove front bumper fascia. Refer to Front Bumper Fascia Replacement
Remove the headlamp. Refer to Headlamp Replacement.
1
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Rear Window Replacement
Special Tools
BO-24402-A Glass Sealant Remover (Cold Knife)
BO-39032 Stationary Glass Removal Tool
Use an adhesive that is approved by GM
For equivalent regional tools, refer to Special Tools
Removal Procedure
Warning: If a window is cracked but still intact, crisscros ...
Valve Guide Reaming, and Valve and Seat Grinding
Valve Cleaning Procedure
Use soft bristle wire brush to clean any carbon build-up from the valve
head. DO NOT use a wire brush on any part of the valve stem. The valve stem
is chrome plated to provide enhanced wear characteristics. Wire brushing
the stem could remove the chr ...