GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 1999 🢒 LeSabre 🢒 Steering 🢒 Power Steering System 🢒 Power Steering System Flushing
  1. Raise the front end of the vehicle until the wheels are free to turn. Refer to Lifting and Jacking the Vehicle in General Information.
  2. Remove the power steering gear outlet hose from the pump reservoir inlet connector. Remove the plug inlet connector port on the reservoir. Refer to Power Steering Hoses Replacement .
  3. Place the end of the return line into a large container in order to catch the fluid that drains from the system.
  4. Ask an assistant to fill the reservoir with new power steering fluid.

    5. Maintain the level at the FULL COLD mark while flushing the system.

  5. Start the engine.
  6. Run the engine at idle speed.

    7. 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.

  7. Turn the steering wheel from stop to stop.

    8. Important: Do NOT re-use any drained power steering fluid.

  8. Continue to drain and flush the system until all of the old fluid is cleared from the system. Add approximately 0.9 liter (1 quart) of new fluid in order to complete the flushing procedure.
  9. When you have completed the flushing procedure, perform the following additional steps:
    10. 9.1. Stop the engine.
    9.2. Unplug the reservoir inlet port.
    9.3. Reconnect the return line.
  10. Fill the reservoir to the FULL COLD level.
  11. Bleed the power steering system. Refer to Power Steering System Bleeding .