Replacing the boot
WARNING: This page is about a different car, the 2004 Volvo S40, 2003 Volvo S40, 2002 Volvo S40, 2001 Volvo S40, and 2000 Volvo S40. However, it is still accessible from the selected car via links, so may be relevant.
Remove the small clip and the boot from the drive shaft. Clean the parts of the tripod and the drive shaft. Check the components.
Position a new small clip. Install the boot on the drive shaft. This creates a larger mating surface against the inner ring.