Hoses, pipes
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2006 Volvo S80, 2005 Volvo S80, 2004 Volvo S80, 2003 Volvo S80, and 2002 Volvo S80. However, it is still accessible from the selected car via links, so may be relevant.
All connections, apart from those for the expansion valve and condenser, have double O-rings as a seal. The connections for the expansion valve and condenser have single O-rings.
The O-rings are manufactured in a specially developed material (HNBR = hydrated nitrile rubber).