Disassembly Procedure
WARNING: This page is about a different car, the 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.
Courtesy of GENERAL MOTORS CORP.
IMPORTANT:
Do not to damage the threads of the steering gear housing when removing the check valve.
Remove the check valve (1) from the steering gear housing (2) using a small screwdriver.