Volvo 850 Restoration - Coolant Leak & Diagnostics

We have been loosing some coolant in our Volvo 850 and so it’s time to try and find the leak! There is also a problem with the air pump (codes EFI-442 and EFI-448) and the ABS pump (code ABS-443), and so we did some testing to diagnose the possible issues regarding those codes. Fair to say, we got in over heads...
Lastly, we also fixed a water leak at the tail gate so the windows will stop fogging up constantly!
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Project’s Background Story -
This 1996 Volvo 850 2.5L 20V estate was owned by our dad and we intend to restore it to its former glory after 9 years of neglect!