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.
Fig 1: Flushing Oil Cooler
Courtesy of VOLVO CARS OF NORTH AMERICA.
Place a container under the oil cooler return line.
Connect a lubricant gun and hose to the oil cooler pressure pipe.