If coolant, it would have distinctive smell and color, and coolant level w/b low.
With A/C running, can you see dripping underneath the car, beneath front passenger's feet? If not, likely a plugged evap drain line. Look for open end hose in that location.
With A/C running, can you see dripping underneath the car, beneath front passenger's feet? If not, likely a plugged evap drain line. Look for open end hose in that location.