Wait Until the Oil And Power Steering Pump Have Reached Operating Temperature
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.
NOTE:
Pressure testing only provides accurate results only when the oil has reached an operating temperature of approximately 80°C.