Disassembly Procedure
WARNING: This page is about a different car, the 2003 GMC Safari and 2003 Chevrolet Astro. However, it is still accessible from the selected car via links, so may be relevant.
Important:
Do not 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.
Courtesy of GENERAL MOTORS CORP.