I did the matrix on my v70 tdi a few years ago, physically swapping out the matrix is easy, and not badly priced either.
but...
The pipes go through the coupling on the bulkhead which on mine was brittle as f**k. No worries, Ill replace that too... £40 quid from volvo will all washers, o rings etc. But if your car has AC you won't be able to swap the part without dismantling ALL of the dash. So a fix that myself and others have done is to use some 15mm Internal diameter pipe, and just break the bulkhead coupling so the pipes go through and just connect up with two lengths of copper pipe and jubilee clips. and silicone up any gaps left. 15k miles later and its fine.
oh yeah, if you are any bigger than a 6 year old then youll struggle to get in to the footwell. But if you happen to have a second elbow or wrist on both of your arms youll be fine. Most fittings are Torx or star bits including a few that a pretty small.
Hope that helps
Ben
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