Ford 2003 Mustang Workshop Manual page 738

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.