Coolant leak

So I've got my inherited 1986 190D 2.5 outside now as we're in the middle of a move. Ever since the temperature has gotten colder I've noticed an ever increasing puddle under the car where I have parked it. I have only driven the car maybe 3-4 times this fall and have wanted to ask the community if anyone else has noticed a coolant leak from a small plastic plug on the drivers side rear of the radiator. As far as I can tell the radiator is original. I have included pictures below of my... Coolant leak

So I've got my inherited 1986 190D 2.5 outside now as we're in the middle of a move. Ever since the temperature has gotten colder I've noticed an ever increasing puddle under the car where I have parked it. I have only driven the car maybe 3-4 times this fall and have wanted to ask the community if anyone else has noticed a coolant leak from a small plastic plug on the drivers side rear of the radiator. As far as I can tell the radiator is original. I have included pictures below of my...

Coolant leak

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