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Power Steering System Purging: Material

WARNING: This page is about a different car, the 2010 Mercury Milan, 2010 Lincoln MKZ, and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
MATERIAL SPECIFICATIONS TABLE

Item Specification
MERCON® V Automatic Transmission Fluid XT-5-QM (or XT-5-QMC) (US); CXT-5-LM12 (Canada) MERCON® V
NOTE: If the air is not purged from the power steering system correctly, premature power steering pump failure may result. The condition may occur on pre-delivery vehicles with evidence of aerated fluid or on vehicles that have had steering component repairs.
  1. Remove the power steering reservoir cap. Check the fluid.
    NOTE: A whine heard from the power steering pump can be caused by air in the system. The power steering purge procedure must be carried out prior to any component repair for which power steering noise complaints are accompanied by evidence of aerated fluid.
  2. Raise the front wheels off the floor. Refer to JACKING & LIFTING for the procedure.
  3. Tightly insert the Power Steering Evacuation Cap into the reservoir and connect the Vacuum Pump Kit.
    Fig 1: Identifying Power Steering Evacuation Cap And Vacuum Pump Kit
    G06125950Courtesy of FORD MOTOR CO.
  4. Start the engine.
  5. Using the Vacuum Pump Kit, apply vacuum and maintain the maximum vacuum of 68-85 kPa (20-25 in-Hg).
    • If the Vacuum Pump Kit does not maintain vacuum, check the power steering system for leaks before proceeding. For additional information, refer to POWER STEERING FLUID LEAK TEST .
  6. If equipped with Hydro-Boost®, apply the brake pedal 4 times.
  7. Cycle the steering wheel fully from stop-to-stop 10 times.
    NOTE: Do not hold the steering wheel against the stops for an extended amount of time. Damage to the power steering pump may occur.
  8. Stop the engine.
  9. Release the vacuum and remove the Vacuum Pump Kit and the Power Steering Evacuation Cap.
  10. Fill the reservoir as needed with the specified fluid.
    NOTE: Do not overfill the reservoir.
  11. Start the engine.
  12. Install the Power Steering Evacuation Cap and the Vacuum Pump Kit. Apply and maintain the maximum vacuum of 68-85 kPa (20-25 in-Hg).
    Fig 2: Identifying Power Steering Evacuation Cap And Vacuum Pump Kit
    G06063959Courtesy of FORD MOTOR CO.
  13. Cycle the steering wheel fully from stop-to-stop 10 times.
    NOTE: Do not hold the steering wheel against the stops for an extended amount of time. Damage to the power steering pump may occur.
  14. Stop the engine, release the vacuum and remove the Vacuum Pump Kit and the Power Steering Evacuation Cap.
  15. Fill the reservoir as needed with the specified fluid and install the reservoir cap.
    NOTE: Do not overfill the reservoir.
  16. Visually inspect the power steering system for leaks.
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