Removing/installing thermostat
WARNING: This page is about a different car, the 2002 Volvo C70, 2001 Volvo C70, 2000 Volvo C70, 1999 Volvo C70, and 1998 Volvo C70. However, it is still accessible from the selected car via links, so may be relevant.
Remove the hose on the thermostat housing cover and remove the thermostat and gasket (Torx 40).
Clean the mating surface of the thermostat housing.
Install a new seal on the thermostat.
Install the thermostat in the housing, install and tighten the cover and hose.
Fill with coolant and run engine until the thermostat opens and top up as necessary.
Check for leaks.