GM Service Manual Online
For 1990-2009 cars only

    Notice: Do not hold the steering wheel against the stops while flushing the power steering system. Holding the steering wheel against the wheel stops will cause high system pressure, overheating, and damage to the power steering pump and/or gear.

  1. Raise the front of the vehicle off the ground until the wheels turn freely.
  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. While an assistant fills the reservoir with new power steering fluid, idle the engine.
  6. Important: Do not contact the wheel stops. Do not hold the steering wheel near a stop position. This stops the fluid flow and places the pump in the pressure relief mode. A sudden overflow from the reservoir may develop if you hold the steering wheel at a stop.

  7. Turn the steering wheel near each stop.
  8. Install any lines, hoses, or components removed from the vehicle.
  9. Fill the system with new power steering fluid.
  10. Bleed the system. Refer to Power Steering System Bleeding .
  11. Operate the engine for approximately 15 minutes.
  12. Remove the pump return line at the pump inlet.
  13. Plug the connection on the pump.
  14. Important: Do not re-use any drained power steering fluid.

  15. As the reservoir fills, inspect the draining fluid for contamination.
  16. If foreign material is still present, complete the following steps:
  17. 14.1. Replace all of the lines.
    14.2. Disassemble the power steering system components.
    14.3. Clean the components.
    14.4. Replace the components, if needed.