WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.
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.
Fig 1: Removing Check Valve From Steering Gear Housing