The 2004 Park Avenue, a third-generation model (GMX330), is a full-size luxury sedan renowned for its comfort-oriented ride, spacious and quiet cabin, and extensive feature availability. Built in Detroit, Michigan, this vehicle aimed to offer a refined driving experience, often competing with other near-luxury and luxury sedans of its era. It featured powerful V6 engine options, including a 3.8L supercharged variant, and was equipped with a 4-speed automatic transaxle. Safety was a priority, with standard front airbags and optional side airbags, along with standard ABS and traction control, earning it 5-star ratings in frontal crash tests. This comprehensive workshop service repair manual provides detailed guidance for all models, engines, trim levels, and transmission types of the 2004 Park Avenue. It covers a vast array of topics essential for maintenance and repair, including in-depth procedures for mechanical and electrical systems, from basic maintenance tasks like oil changes to complex repairs of the engine, transmission, brakes, suspension, and electrical components. The manual also includes diagnostic procedures, symptom-based troubleshooting, and detailed wiring diagrams, making it an invaluable resource for owners and technicians alike to ensure the optimal performance and longevity of the vehicle.