That area is where the evaporator drain exits the body of the car. By any chance do you have the temperature set to auto with the snowflake showing.
If not, I'd suspect a coolant line is leaking. Unfortunately, I don't recall the exact routing of the lines that link the radiators to the engine so it's unclear if you'd see coolant on the ground where you suspect its coming from.
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'87 951
'01S 986 (Sold after 16 years ownership)
'78 924 (carburated; sold when moving to CA)
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