2. Check the power supply. The sunroof motor requires power to operate, so make sure the fuse for the sunroof is not blown.
3. Check the sunroof tracks. The sunroof may not be able to close if the tracks are blocked or dirty. Clean the tracks and remove any obstructions.
4. Check the sunroof motor. The sunroof motor may be damaged if it is making clicking noises. You may need to replace the sunroof motor if it is damaged.
5. Check the sunroof regulator. The sunroof regulator may be damaged if the sunroof is not able to close. You may need to replace the sunroof regulator if it is damaged.
6. If you have tried all of the above and the sunroof still does not close, you may need to take your Mustang to a qualified mechanic.