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First thing I would suggest is cleaning off that area so you can see exactly what is leaking; from the pictures I can see 4 or 5 different possibilities. If it is just one of the hoses you just replace that hose; if it's from an area near there you'll be able to determine what it is that is leaking. High pressure leaks can be a little elusive to chase down, having a clean and dry area first will make it easier to pinpoint the exact source of the leak.
To clean that area, just get a can of engine spray cleaner and clean just that whole area, then rinse it off and let it dry.
Come back a few hours later when it is dry; make sure your coolant is topped off; then start your car. Watch the area with a flash light and look for the leak once it does start leaking; make sure to have the heater in the car OFF and set to COLD. If after it comes to temperature there's no leak; then turn your heater to full hot and low fan, go back and watch the area for leaks. This will give you a good starting point.
If there was a partial blockage in the drain at the ac box it is possible that water will still drip out over time . However some Toyota ac units use the same box for the heater core so I would be looking for a coolant leak in that area . Check coolant level and have a pressure test done on the coolant system to check for the leak. If the drain is in the frame under the car ,the water may be also from the windscreen plenum chamber that collects water from the windscreen and drains in that area.
After the engine has reached normal operating temperature, feel both heater hoses going into the firewall. Are both hot? If both are hot, it's probably the door or doors in the heater case not operating from the selector knob on the dash. If only one hose is hot, the coolant is not circulating through the heater core. Look for a water valve in the hoses that is shut. If no valve, crack open the cold line to see if you can start circulation through the core. If neither hose is hot, pull off the inlet to the heater core (it may come from the cylinder head area) and run the engine and check stream flow. It won't spurt out like a garden hose, it should flow out in a smooth even stream, maybe just enough pressure to push a steady stream. If no flow comes out, coolant is low, or there is a circulation problem in the engine, like a kinked hose, a weak water pump...
Does the radiator cap hold pressure in the cooling system?
is it coming from a related heater hose ,or freez plug ?,pinning it down is the hardest part , if you can clean area as best as possible after everything is dry and clean put a piece of cardboard under it to try to pin point area and a good light ,hope this helps ,good luck .
Is it low in water?You have a heater control valve on that side . Your heater hoses connects to it to let hot water in the car when the heater is turned on. Check and make sure the passenger floor is dry. If it is wet you will need a heater core