🏷️ Basic Information Identification Make: Buick Model: Century Year: 2004 Chassis Code: W-body Generation: Third Generation (1997-2005) 👋 Introduction Market Position Vehicle Segment: Mid-size Sedan Target Demographic: Families, commuters, value-conscious buyers. Competitive Analysis Key Competitors: Chevrolet Impala, Ford Taurus, Dodge Intrepid, Toyota Camry, Honda Accord. Key Features Of Manual Convenience: Instant online access, searchable format, accessible on multiple devices. Accuracy And Licensing: Officially licensed, derived from OE materials by RepairSurge. Cost Effectiveness: Saves money on repair shop labor costs. 📋 Manual Details Identification Manual Type: Service and Repair Manual Software Language: English Format: PDF Download Access Duration: 1 Year (with discounts for renewal) Compatibility: PC, Laptop, Smartphone, Tablet (via web browser) 📖 Manual Coverage Systems Engine Service And Repair: Complete diagnostic, repair, and overhaul procedures for all 2004 Century engine options. Drivetrain Service And Repair: Covers front-wheel drive, transmission (automatic), axle, driveshaft, and differential service. Suspension And Steering Service And Repair: Detailed information on front and rear suspension components, steering gear, power steering system, and wheel alignment. Brake System Service And Repair: Comprehensive coverage of hydraulic and mechanical aspects, including ABS, brake fluid, pads, rotors, calipers, and lines. Electrical System Diagnosis And Repair: Extensive wiring diagrams, component locations, and diagnostic procedures for all electrical systems, including starting, charging, lighting, and accessories. Heating And Air Conditioning Service: Detailed procedures for A/C system servicing, refrigerant handling, component replacement, and diagnosis. Body And Frame Repair: Information on body panel repair, corrosion protection, door mechanisms, glass replacement, and interior trim. Procedures Preventative Maintenance Schedules: Detailed recommended service intervals for all major maintenance tasks. Diagnostic Troubleshooting Guides: Systematic troubleshooting trees and flowcharts for common and uncommon issues. Component Replacement Instructions: Step-by-step guides for replacing virtually any component on the vehicle. Torque Specifications And Tightening Sequences: Precise torque values for all critical fasteners. Technical Depth Depth Of Coverage: OE-level technical information, suitable for professional technicians and advanced DIYers. 📊 Manual Specifications File Format File Type: PDF Searchability: Searchable text content for quick information retrieval. Print Quality Clarity: High-resolution diagrams and text. Binding Type Physical Binding: N/A (Digital Download) Paper Type Physical Paper Type: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Code Main: LA1 Engine Type: 3.8L V6 OHV Displacement Cc: 3800 Bore X Stroke: 3.78 in x 3.40 in (96.0 mm x 86.4 mm) Compression Ratio: 9.4:1 Performance Horsepower Hp: 200 hp @ 5200 rpm Torque Lb-Ft: 230 lb-ft @ 4000 rpm Fuel System Fuel Delivery: Multi-port Fuel Injection (MPFI) Fuel Type: Unleaded Regular 87 Octane Engine Management ECM: PCM (Powertrain Control Module) 🔧 Transmission Standard Transmission Type: 4-Speed Automatic Model: 4T65-E Gear Ratios: Refer to manual for detailed ratios (specific to 4T65-E). Fluid Type: Dexron III/Mercon (or equivalent specified in manual) Features Drive Type: Front-Wheel Drive (FWD) 📐 Dimensions Exterior Length: 195.2 inches Width: 70.1 inches Height: 56.4 inches Wheelbase: 109.0 inches Weights Curb Weight Lbs: 3360 - 3450 lbs (approx., depending on trim and options) Gross Vehicle Weight Rating Gvwr Lbs: Approximately 4500 lbs Cargo Trunk Volume Cu Ft: 15.7 cu ft 🛡️ Safety Features Ratings NHTSA Front Impact Driver: 5-Star (as per NHTSA data for similar W-body vehicles of the era) NHTSA Front Impact Passenger: 5-Star (as per NHTSA data for similar W-body vehicles of the era) IIHS Moderate Overlap Frontal Offset: Good (refer to IIHS archives for specific model year ratings) Active Features ABS: Standard Anti-lock Braking System Traction Control: Available Traction Control System (TCS) Passive Features Airbags Front: Driver and front passenger airbags Airbags Side: Available side-impact airbags (often optional) Seatbelts: Three-point seatbelts for all occupants, pretensioners for front seats. 💡 Technology Features Infotainment Audio System: AM/FM stereo with CD player and/or cassette player. Optional Monsoon premium audio system. Climate Control: Manual or optional automatic climate control (HVAC). Driver Assistance Cruise Control: Standard cruise control. Connectivity Onstar Availability: Available OnStar telematics system on select trims. 🔧 Maintenance Service Intervals Oil Change Interval: Every 3,000-5,000 miles or as indicated by oil life monitor (refer to manual for specifics). Engine Air Filter Replacement: Every 15,000-30,000 miles or as needed. Spark Plug Replacement: Refer to manual; typically around 100,000 miles for recommended iridium plugs. Transmission Fluid Change: Every 30,000-60,000 miles (inspect condition). Check manual for specific recommendation. Fluid Specifications Engine Oil Type: SAE 5W-30 (Synthetic recommended for optimal performance and protection) Engine Oil Capacity Quarts: 4.5 quarts (with filter) Coolant Type: Dex-Cool (GM 6043-M) Orange Long Life Antifreeze/Coolant Brake Fluid Type: DOT 3 Known Issues Intake Manifold Gasket Leaks: Common on early 3800 V6 engines, especially the Series II. Look for coolant leaks. Power Steering Pump Noise: Can develop a whine or groan, often due to fluid leaks or pump wear. Window Regulator Failure: Common failure point for power windows, leading to windows not moving. Alternator Failure: Alternators can fail prematurely on some models. Transmission Shifting Issues: Can experience slipping or delayed...