There are many coolant hoses in that area. A good flashlight will help. Check the heater hoses carefully, they run from the front under the throttle body, to the firewall above the starter. There are hoses which go to the throttle body as well for air/fuel heating. Check these too.
Preasure builds after a warm engine is turned off, and the leak will be more pronunced at that time.
Check the service manual for a pic of the thermostat housing for an idea of where the hoses are located.
Be carful not to tug on a rotted hose while the engine is hot! Wear gloves and eye protection!
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