🏷️ Basic Information Identification Make: Buick Model: Century Year: 2003 Codes Platform: GM W-body 👋 Introduction Market Position Positioning: The 2003 Buick Century was positioned as a comfortable, practical, and value-oriented mid-size sedan, appealing to a broad demographic seeking reliable transportation. Competitive Analysis Competitors: Competed against vehicles like the Ford Taurus, Chevrolet Impala, Dodge Intrepid, and Toyota Camry in the mid-size sedan segment. Key Features Highlights: Known for its comfortable ride, spacious interior, and dependable V6 engine options. Offered a good balance of features for its price point. 📋 Manual Details Coverage Areas Manual Type: Official Service and Repair Manual Software Language: English Format: PDF Download (via web browser access) Access Duration: 1 Year (with renewal options) 📖 Manual Coverage Systems Covered Engine: Complete service, diagnostics, and repair for all 2003 Century engine variants. Drivetrain: Detailed procedures for automatic transmission service, overhaul, and diagnosis; drive axle and CV joint service. Brakes: Comprehensive coverage of hydraulic systems, ABS, brake pad/rotor replacement, caliper service, and parking brake adjustments. Steering: Power steering system service, diagnosis, and component replacement (pump, rack and pinion). Suspension: Front and rear suspension component service (shocks, struts, control arms, ball joints, sway bar links), alignment specifications. Electrical: Full wiring diagrams, diagnostic procedures for all electrical systems, battery, charging system, starting system, lighting, and accessories. HVAC: Air conditioning system service, refrigerant handling, heater core replacement, climate control system diagnosis. Body: Body panel repair, interior trim removal and installation, glass replacement, door and lock mechanisms. Procedures Included Maintenance: Oil changes, filter replacements, fluid level checks and top-offs, tire rotations, spark plug replacement, belt inspection and replacement. Troubleshooting: Diagnostic flowcharts and symptom-based troubleshooting guides for common and complex issues. Repair: Step-by-step instructions for component replacement, rebuilds, and system repairs. Diagnostics: OBD-II diagnostic trouble code (DTC) interpretation and diagnostic procedures. Technical Depth Depth: Comprehensive coverage from basic preventative maintenance to advanced engine and transmission overhauls, including detailed diagnostic procedures. 📊 Manual Specifications File Format Format: PDF Download Searchability: Text-searchable PDF for quick information retrieval. Print Quality: High-resolution, printable pages. Binding Type Binding: N/A (Digital Download) Paper Type Paper: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Code 1: 3.1L V6 (L82/LG8) Displacement 1: 3.1 Liters (189 cubic inches) Horsepower 1: 150 hp @ 5200 rpm (approx.) Torque 1: 185 lb-ft @ 4000 rpm (approx.) Alternative Engine Engine Code 2: 2.2L Inline-4 (L43) Displacement 2: 2.2 Liters (134 cubic inches) Horsepower 2: 115 hp @ 5200 rpm (approx.) Torque 2: 135 lb-ft @ 3800 rpm (approx.) Fuel System Fuel Delivery: Multi-port Fuel Injection (MPFI) Engine Management ECU Type: GM Gen III Powertrain Control Module (PCM) 🔧 Transmission Standard Type 1: 4-speed Automatic Transaxle Transmission Model 1: GM 4T65-E Optional Type 2: N/A (2003 model year was exclusively automatic) Features Features: Lock-up torque converter for improved fuel economy at highway speeds. 📐 Dimensions Exterior Length: 193.3 inches Width: 70.4 inches Height: 55.9 inches Wheelbase: 109.0 inches Interior Passenger Volume: 98.0 cubic feet (approx.) Cargo Trunk Volume: 16.7 cubic feet (approx.) Weights Curb Weight Min: 3300 lbs (approx. for 4-cyl models) Curb Weight Max: 3500 lbs (approx. for V6 models) 🛡️ Safety Features Ratings NHTSA Driver Frontal Crash Rating: Good (2003 model year testing) NHTSA Passenger Frontal Crash Rating: Good (2003 model year testing) Active Features ABS: Standard Anti-lock Braking System (ABS) Traction Control: Optional Traction Control System (TCS) on some models. Passive Features Airbags Front: Driver and front passenger airbags Airbags Side: Optional front side-impact airbags. 💡 Technology Features Infotainment Audio System: Standard AM/FM stereo with CD player or cassette. Optional premium sound systems available. Climate Control: Manual climate control standard; optional automatic climate control on higher trims. Driver Assistance Cruise Control: Standard cruise control. Connectivity Onstar: Optional OnStar in-vehicle safety and communication system available. 🔧 Maintenance Service Intervals Oil Change Interval: Every 5,000 - 7,500 miles or 6 months, whichever comes first (depending on oil type and driving conditions). Transmission Fluid Change: Recommended every 60,000 - 100,000 miles, or as per severe service schedule. Spark Plug Replacement 3.1L: Platinum-tipped plugs typically rated for 100,000 miles. Refer to manual for specific type. Fluid Specifications Engine Oil Type: SAE 5W-30 (API certified) Engine Oil Capacity 3.1L: 4.5 US quarts (4.3 Liters) with filter change. Transmission Fluid Type: Dexron-III H Automatic Transmission Fluid (ATF) Coolant Type: GM Universal Orange Coolant (or equivalent silicate-free, long-life coolant) Known Issues Common Issues List: Intake manifold gasket leaks (3.1L V6), power steering pump leaks, occasional issues with window regulators and door locks, and potential for catalytic converter failure. 📚 Vehicle History Brand Heritage Brand Legacy: Buick has a long history of producing comfortable and reliable American sedans, often associated with a premium feel and smooth ride. Model Evolution Generation: This 2003 model represents the third generation of the Buick Century (introduced in 1997), based on the GM W-body platform shared...