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You really need to start a new post.
The only picture I could find on the firewall coupler was from the cabin side. It showed plastic/O ring/plastic/ O ring/ coupler. http://www.matthewsvolvosite.com/forums/viewtopic.php?f=1&t=40547
Do not buy URO junk. If you wind up getting a new coupler at the dealer, it comes with O rings.
Look at Ebay for a new heater core, somewhere around $40 for a new one.
Vacuum line: I believe it goes from the manifold to the flame trap, and is part of the large hose from the oil separator.
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My back feels better when I sit in a Volvo seat
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