Howya lonewolf, the only cheap fix for a heater matrix is to unhook the 2 pipes going through the firewall into the cabin and join them together using a hose and some hoseclips.
downside is you don't have any heater.
Replacing the matrix is a dash-out job, and any second hand matrix could potentially leak at any minute, they're also notoriously fragile so if the person that took it out of the donor car wasn't careful they could easily damage it.
Sorry to be bringing this up on your first post but...
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