Checking 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.
The function of the thermostat can be tested using hot water.
When the water temperature corresponds to the opening temperature of the thermostat, the thermostat should open fully within two minutes.
Marking: 90
Starts to open at: 90°C
Fully open at: 105°C