The A/C drain hose on a Buick Park Avenue Ultra is located
inside the passenger compartment, typically behind the glove box or under the dashboard near the passenger side footwell. It's a small, usually black, hose that drains condensation from the air conditioning system. It's not always easily visible and might be tucked away. You'll likely need a flashlight and possibly some maneuvering to find it.
Because of its location and the potential variations between model years, it's recommended to consult a repair manual specific to your vehicle's year. A repair manual will have diagrams showing the exact location. You can find these manuals online or at auto parts stores.
