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Power Steering System Purging

WARNING: This page is about a different car, the 2002 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Special Tool(s)
G01105236Courtesy of FORD MOTOR CO.
CAUTION: If the air is not purged from the power steering system correctly, pump failure could result. This condition can occur on pre-delivery vehicles with evidence of aerated fluid or on vehicles that had steering component repairs.
    WARNING: Do not mix fluid types. Any mixture of an unapproved fluid could lead to seal deterioration and leaks. A leak could ultimately cause loss of fluid, which could result in a loss of power steering assist.
    CAUTION: Do not overfill the power steering fluid reservoir.
    NOTE: A whine heard from the power steering pump may 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 and after installation of any new power steering system components (gear, hose, etc.).
  1. Remove the fluid reservoir cap and check the fluid.
    • Using the special tool, tightly insert the stopper into the fluid reservoir.
    • Start the vehicle.
  2. Apply maximum vacuum for a minimum of three minutes at idle. Maintain maximum vacuum with the source.
    Fig 2: Applying Vacuum To Reservoir
    G01105237Courtesy of FORD MOTOR CO.
  3. Remove the special tool.
    4. WARNING: Do not mix fluid types. Any mixture of an unapproved fluid could lead to seal deterioration and leaks. A leak could ultimately cause loss of fluid, which could result in a loss of power steering assist.
    Fig 3: Adding Fluid To Reservoir
    G01105238Courtesy of FORD MOTOR CO.
  4. Add fluid to the appropriate level.
    • Use Motorcraft MERCON® Multi-Purpose (ATF) Transmission Fluid XT-2-QDX or equivalent meeting Ford specification MERCON®.
  5. Using the special tool, apply and maintain maximum vacuum.
    6. CAUTION: Do not hold the steering wheel against the stops for more than three to five seconds. Damage to the power steering pump will occur.
  6. Cycle the steering wheel from stop to stop every 30 seconds for approximately five minutes.
  7. Remove the special tool and install the fluid reservoir cap.
    8. WARNING: Do not mix fluid types. Any mixture of an unapproved fluid could lead to seal deterioration and leaks. A leak could ultimately cause loss of fluid, which could result in a loss of power steering assist.
  8. Check the fluid level and for leaks at all connections. If the power steering still shows signs of aeration, repeat this procedure.
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