GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 1999 🢒 Century (China) (CNG) 🢒 Steering 🢒 Power Steering System 🢒 Draining the Power Steering System
  1. Raise the front of the vehicle off of the ground. Ensure that the front wheels are free to turn. Refer to Lifting and Jacking the Vehicle in General Information.
  2. Remove the power steering return hose from the power steering pump.Refer to Power Steering Return Hose Replacement .
  3. Plug the inlet connector port on the power steering pump.
  4. Position the fluid return hose toward a large container in order to contain the draining fluid.
  5. Perform the following procedure:
    6. 5.1. Start the engine.
    5.2. Run the engine at idle.

    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.

  6. Turn the steering wheel from stop-to-stop.

    7. Ensure that all of the old power steering fluid is cleared from the power steering system.

  7. Turn the ignition switch to the OFF position.
  8. Flush the power steering system if the power steering fluid is contaminated. Refer to Power Steering System Flushing .
  9. Unplug the power steering pump inlet port.
  10. Reconnect the power steering return line.Refer to Power Steering Return Hose Replacement
  11. Fill the power steering system with power steering fluid.Refer to Refilling the Power Steering System .
  12. Bleed the power steering system. Refer to Power Steering System Bleeding .