Both the connection and the tank. The PO epoxied the connection when it cracked and the epoxy has failed so leaking coolant has put a stop on the sorting out.
I hear you about the interior parts.
Buffalo is about a 6.5 hr drive from me..
How are the rear seat windows, do they both go up and down?

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95 E300D gave away
77 300D, 227k, station car
83 300CD 370k, body gone away to the rust gods, engine is in a Yota pickup, going strong
89 190E 2.6- 335k, no more
79 VW FI Bus- 154k summer driver
59 VW Beetle ragtop- 175k
12 VW Jetta- 250k
74 MG Midget-78k