I think one of the heater hoses is leaking. It leaks coolant outside the car after warmup. The top and bottom radiator hose are fine.
There are a couple causes for this. The most common is that the hose has just deteriorated with age. A qualified technician will do a coolant system pressure test to identify any and all leak locations and the causes. For this I would suggest one of the great technicians from YourMechanic.
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