Removing the nut from the ball joint (both sides)
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2006 Volvo S80, 2005 Volvo S80, 2004 Volvo S80, 2003 Volvo S80, and 2002 Volvo S80. However, it is still accessible from the selected car via links, so may be relevant.
Remove the nut for the lower ball joint and control arm. Clean the exposed threads outside the nut. Spray using rust solvent before removing the nut. Counterhold with Torx TX 40 at the ball joint pinion when removing the nut. This is so that the ball joint boot does not turn.
For steel control arm, see: