I use YouTube as my primary reference point for questions such as this. Your model Volvo is has the same intake from 2002-2006, so here's what I found...
Looks like a real J-O-B!
there is also this one:
I became curious about this system so I did a little research. Here's what I came up with on the crankcase ventilation system, so it's easier to understand:
The end result is you don't have vacuum loss due to crank ventilation, as there is no vacuum powering this system!
So, if you have The Groove, just "Drive it like you STOLE it!"
Ron
Ron Hatton
Developer of The Gadgetman Groove
and Snake Oil-https://SnakeOil.wtf/?wpam_id=1
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The following user(s) said Thank You: GregK, Michael Lee, CLAUDIO CORDOVA