Removing the thermostat
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.
Courtesy of VOLVO CARS OF NORTH AMERICA.
Turbocharged engines: remove the throttle body (TB) cover.
Remove the cover over the fuel rail.
Remove the upper timing cover.
Remove the thermostat housing cover (Torx 40 screws). Lift out the thermostat and the gasket.