In part, the issue is where is the leak occurring. If it's in the middle of the car, between the front and back wheels, there are three possibilities. One is water from the evaporator draining after A/C use. The others are a leak in the heater core or hoses that finds its way out of the car possibility where the evaporator drain tube passes through the body or a leak in the coolant tubes that circulates coolant between the engine and radiators.
If the stuff on the floor is coolant, which you think it is, then the last two items are possibilities.
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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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