S80 Low Pressure Connector to add refergerant

[chrism]

You should find it hidden undernieth the coolant overflow and power steer resevoirs. You can probably just barely see it with those resevoirs in place, but most likely you'll have to move one or both out of the way in order to connect a charge hose.

[jimmy57]

The video shows it for a P3 (2007- later) car. On the 99-06 it is on frame rail in front of timing belt cover but usually the hose from coolant tank that runs back behind engine obscures the filler valve as Chrism listed..
If it is a 2002-2005 T6 be careful with the hard plastic line to fitting in middle of timing belt cover. The nipple out of cylinder head the hose attaches too is not forgiving for being bent.

Regardless of which generation S80 you're covered.