🏷️ Basic Information Identification Make: Cadillac Model: Sedan de Ville Year: 2004 Codes Chassis Code: GMT823 Vds Vin Digit 4: U Vds Vin Digit 5: K 👋 Introduction Market Position Segment: Full-size luxury sedan Positioning: Flagship model for Cadillac, emphasizing comfort, quietness, and advanced features for its era. Competitive Analysis Competitors: Lincoln Town Car, Chrysler 300M (later Chrysler 300), Buick Park Avenue, Mercury Grand Marquis Key Features Design Philosophy: Art and Science design language, focused on bold, sharp lines and a distinctive Cadillac presence. Powertrain Focus: V8 engine power and smoothness, front-wheel drive for packaging and traction. Comfort Features: Focus on ride quality, spacious interior, advanced climate control, and sound deadening. Manual Advantage: Provides the definitive resource for understanding and repairing this specific vehicle, going beyond generic guides. 📋 Manual Details Coverage Areas Coverage Scope: All models and all repairs A-Z Page Count Estimated Page Count: 1500+ Manual Type Type: Factory Service Manual (FSM) / Repair Manual Language Language: English Format Format: Print (Paperback) 📖 Manual Coverage Systems Covered Powertrain: Engine mechanical, lubrication, cooling, fuel, exhaust, engine control systems (ECM/PCM), ignition, starting, charging Transmission: 4-speed automatic (4L60-E/4L65-E), diagnosis, repair, overhaul, torque converter Drivetrain: Front-wheel drive (FWD), axles, drive shafts, differential, wheel bearings Suspension: Front and rear suspension systems, springs, struts, shocks, control arms, bushings, ball joints, steering knuckles Steering: Power steering system, steering column, steering rack, tie rods, diagnosis and repair Brakes: Front and rear disc brakes, ABS (Anti-lock Braking System), traction control (TCS), brake hydraulics, calipers, rotors, pads, lines, master cylinder, hydroboost system Wheels And Tires: Wheel specifications, tire pressure monitoring system (TPMS), lug nut torque specifications Body And Frame: Body panel removal and installation, structural repair, rust repair, undercoating, weatherstripping, doors, hood, trunk, glass, mirrors Interior: Seats, upholstery, dashboard, trim panels, headliner, HVAC controls, interior lighting HVAC: Heating, Ventilation, and Air Conditioning (HVAC) system, refrigerant handling, compressor, evaporator, condenser, blower motor, climate control modules Electrical System: Battery, charging system, starting system, lighting (headlights, taillights, interior), fuses, relays, wiring diagrams, body control module (BCM), powertrain control module (PCM) Instrumentation And Gauges: Instrument cluster, gauges, warning lights, driver information center (DIC) Audio And Entertainment: Radio, CD player, speaker system, antenna Security System: Anti-theft system, keyless entry, remote start (if equipped) Driver Information System: On-board diagnostics (OBD-II), diagnostic trouble codes (DTCs) Procedures Included Maintenance: Scheduled maintenance, oil changes, filter replacements, fluid checks and changes, brake service, tune-ups Diagnosis: Troubleshooting guides, symptom-based diagnostics, DTC interpretation, electrical system diagnosis, mechanical component testing Repair: Step-by-step repair instructions for all major components and systems, component removal and installation, adjustments, calibrations Overhaul: Detailed procedures for engine and transmission overhauls, including component specifications and clearances Wiring: Comprehensive wiring diagrams for all electrical systems, including connector pinouts and wire colors Torque Specifications: Exact torque values for critical fasteners throughout the vehicle Specifications: Detailed technical specifications for all components, including clearances, tolerances, pressures, and fluid capacities Technical Depth Depth: Factory-level detail, suitable for professional technicians and advanced DIY enthusiasts 📊 Manual Specifications File Format Format: Printed Paperback Print Quality Quality: High-quality paper and printing, designed for durability in a workshop environment Binding Type Binding: Durable Paperback Binding Paper Type Paper: Glossy/Satin Finish Paper for clarity and longevity ⚙️ Engine Specifications Primary Engine Engine Type: Naturally Aspirated V8 Engine Code: LS6 (for Northstar variants) Displacement: 4.6L (279 cu in) Bore X Stroke: 3.56 in x 3.31 in (90.5 mm x 84.0 mm) Compression Ratio: 10.3:1 Cylinder Head Design: Dual Overhead Camshafts (DOHC), 4 valves per cylinder Performance Horsepower: 275 hp @ 5600 rpm (Standard), 300 hp @ 6000 rpm (Performance Variants) Torque: 295 lb-ft @ 4400 rpm (Standard), 325 lb-ft @ 4000 rpm (Performance Variants) Fuel System Fuel Delivery: Sequential Electronic Fuel Injection (SEFI) Fuel Type: Premium Unleaded Gasoline (91 Octane Recommended) Engine Management: Bosch Motronic ME7.1 (or similar GM controller) Engine Cooling Cooling System Type: Liquid-cooled Coolant Capacity: Approx. 12.0 quarts (11.3 Liters) Lubrication Oil Capacity: Approx. 4.5 quarts (4.3 Liters) Recommended Oil Viscosity: SAE 5W-30 (API SM or higher) Engine Code Details Ls6 Northstar Notes: The 4.6L Northstar V8 was renowned for its smooth operation and technological sophistication, featuring variable valve timing (VVT) and often semi-sequential fuel injection. 🔧 Transmission Standard Transmission Type: 4-speed automatic overdrive Transmission Model: 4L60-E (most common) / 4L65-E (heavy-duty variant) Optional Optional Transmissions: None offered for this model year Features Shift Modes: Driver selectable modes (e.g., Normal, Sport) Torque Converter: Lock-up torque converter for improved fuel efficiency Fluid Specifications Transmission Fluid Type: Dexron-VI (or Dexron-III H as a prior specification) Fluid Capacity Transmission Fluid Capacity: Approx. 11.5 quarts (10.9 Liters) (dry fill) 📐 Dimensions Exterior Length: 201.0 inches (5105 mm) Width: 75.0 inches (1905 mm) Height: 57.5 inches (1460 mm) Wheelbase: 115.3 inches (2929 mm) Front Track: 62.0 inches (1575 mm) Rear Track: 61.0 inches (1550 mm) Weights Curb Weight: Approximately 3800-4000 lbs...