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 WarningWindshield Header Courtesy Lamp Replacement
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Windshield Header Courtesy Lamp Replacement
Callout
Component Name
1
Windshield Header Courtesy Lamp
Procedures
Grasp the courtesy lamp assembly and pull downward to release the
retainer clips ...
Steering Linkage Inner Tie Rod Inspection
Special Tools
GE-8001 Dial Indicator Set
For equivalent regional tools, refer to Special Tools.
Note: This inspection procedure does not supersede local government
required inspections that have more stringent requirements.
Turn the ignition key to the ON position with the eng ...
Radiator Cleaning
Warning: NEVER spray water on a hot heat exchanger. The resulting
steam could cause personal injury.
Caution: The heat exchanger fins are necessary for good heat transfer.
Do not brush the fins. This may cause damage to the fins, reducing heat transfer.
Note: Blow compressed ...