Look for a four inch long rubber hose with a ninety degree bend in it hanging down from in front of the firewall, passenger side. If coolant is dripping from that, the heater core is leaking in the dash. That tube carries the water out that condenses on the AC evaporator when the air conditioning system is running. The drip pan also catches coolant leaking from the heater core. Be sure that hose is wet inside. If it is not, the better suspect is a leaking heater hose, possibly due to a loose or rusted hose clamp. Those go in usually right above that drain hose.
If you still cannot find the source of the leak, consider adding a small bottle of dark purple dye to the coolant, then check a day later with a black light. The dye will show up as a bright yellow stain that you can follow back to the source. Auto parts stores will have the dye for the fluid being tested, and those that rent or borrow tools should have a black light.
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Friday, May 5th, 2017 AT 9:44 PM