GM Service Manual Online
For 1990-2009 cars only
  1. Raise the front of the vehicle off the ground until the wheels are free to turn.
  2. Remove the fluid return line at the pump inlet connector.
  3. Plug the connector port on the pump.
  4. Position the line toward a large container in order to catch the draining fluid.
  5. Run the engine at idle while an assistant is filling the reservoir with new power steering fluid. Refer to Checking and Adding Power Steering Fluid
  6. Important: DO NOT contact the wheel stops or hold the wheel near a stop position. Fluid will stop and the pump will be in pressure relief mode if the wheel stops are contacted, or if you hold the wheel near a stop position. A sudden overflow from the reservoir may develop if you hold the wheel at a stop.

  7. Turn the steering wheel close to each stop.
  8. Install all of the lines, the hoses, and the components (if removed) on the vehicle.
  9. Fill the system with new power steering fluid. Refer to Checking and Adding Power Steering Fluid
  10. Bleed the system. Refer to Power Steering System Bleeding .
  11. Operate the engine for about 15 minutes.
  12. Remove the pump return line at the pump inlet.
  13. Plug the connection on the pump.
  14. Inspect the draining fluid for contamination, while refilling the reservoir.
  15. If foreign material is still evident, replace all lines, and disassemble and clean the power steering system components. Replace any components, as needed. Do not reuse any drained power steering fluid.