Ford 2003 Mustang Workshop Manual page 732

9. 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.
10. Install the fuel pump fuse.
11. 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.
Start the engine and turn the steering wheel from stop-to-stop.
12. CAUTION: Do not overfill the reservoir.
NOTE: If the power steering system is noisy and is accompanied by evidence of aerated fluid it
will be necessary to purge the power steering system.
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.