My AC drain was tucked in a funny angle behind my fuel pump. It wasn't until I jammed my hand behind the pump and felt the tube could I pull it into view, but once I felt the end of an empty hose I was pretty sure I wasn't tugging on something else.
Is your drain tube intact on the evaporator side, inside the cabin on the passenger side? Could a PO have cut your drain tube on either end? I believe it's possible to clear the drain by blowing compressed air from the evaporator side and patching the hose back together.
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