Ford Mustang (1999-2004) Service Manual: Purging - CIII Power Steering Pump

Special Tool(s)

CAUTION: If the air is not purged from the power steering system correctly, premature power steering pump failure can result. This condition can occur on pre-delivery vehicles with evidence of aerated fluid or on vehicles that have had steering component repairs.

1. NOTE: A whine heard from the power steering pump may be caused by air in the system. The power steering purge procedure must be performed prior to any component repair for which power steering noise complaints are accompanied by evidence of aerated fluid.

Remove the reservoir cap. Check the fluid level. If necessary, fill the reservoir to the correct level.

• Use Motorcraft MERCON Multi-Purpose ATF XT-2-QDX or MERCON equivalent.

2. Tightly insert the Vacuum Pump stopper into the reservoir.

3. Start the vehicle.

4. Using the special tool, apply maximum vacuum and maintain it for a minimum of three minutes with the engine speed set at idle.

5. Release the vacuum and remove the special tool.

6. CAUTION: Do not overfill the reservoir.

Check the fluid level. If necessary, fill the reservoir to the correct level.

• Use Motorcraft MERCON Multi-Purpose ATF XT-2-QDX or MERCON equivalent.

7. Reinstall the special tool. Apply and maintain maximum vacuum.

8. CAUTION: Do not hold the steering wheel against the stops for more than three to five seconds at a time. Damage to the power steering pump will occur.

Cycle the steering wheel fully to the left and right every 30 seconds for approximately five minutes.

9. Stop the engine, release the vacuum, and remove the special tool.

10. Install the reservoir cap.

11. Check for fluid leaks at all of the connections. If the power steering fluid shows signs of air, repeat this procedure.