The drain for the evaporator is located next to the heater hose where it attaches to the heater core under the hood. It should be a rubber line. Check out the diagrams (Below). Please let us know what you find. We are interested to see what it is.
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.