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+1, it's your heater core! Both sides of the heater core are plastic, they do crack. Most likely the crack is near the pipe, that's why you think the o-ring have failed.
Coolant flows from the engine's driver side into the heater core & out to the aux water pump. So if you want to bypass the "LEAKING" heater core, you either have to install a ball valve on the engine's driver side too or run a hose from there to the aux water pump.
I did mine 5 years ago. Yes, looks pretty scary...but actually not too bad, just time consuming.
Like Holmesuser01 said, you have to remove that metal bracket & nylon divot, before the pipe can be loosen (see pic#2).
Pic#3 shows the pipe on the right side attached to the heater core, notice the sides are "PLASTIC".
Pic#4 shows the pipe removed from the heater core, pipe inserts into core ~1/2". Also shows the evaporator (after the heater box is removed) on the other side of the fire wall. NOTE: Evaporator can only be removed from the engine bay.
Pic#5 shows the heater box removed, you have to take apart the heater box to replace the heater core.
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85' 190E w/collector plates
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