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You mean the pipes from the matrix stick through the firewall, so the only hoses are in the engine bay? Does this mean that my leak must positively be on the heater core itself? No possibility of a cracked or untight hose!?
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On my '98 940 LPT / AC the rigid pipes of the heater matrix stick through the bulkhead. So the pipes you see when you remove the rubber hoses, are actually the pipes of the heater matrix itself. You can be sure that it is the matrix itself that is leaking.
Attached picture of the matrix, encircled pipes stick through the firewall. A new OEM matrix is about 210 / 250 Euro, a Nissens imitation about 50 Euro.