Ford 2003 Mustang Workshop Manual page 1637

13. Remove the nut and separate the A/C tube from the condenser.
14. Disconnect the A/C tube at the evaporator.
15. Remove the A/C tube.
1. Disconnect the pin-type retainer.
2. Remove the A/C tube.
16. Disconnect the evaporative emissions (EVAP) return tube.