🏷️ Basic Information Identification Make: Cadillac Model: STS Year: 2004 Codes Platform: GM Sigma 👋 Introduction Market Position Segment: Entry-level luxury sedan Competitive Analysis Competitors: BMW 5 Series, Mercedes-Benz E-Class, Audi A6, Lexus GS Key Features Platform: GM Sigma platform, rear-wheel drive bias with available all-wheel drive Powertrain Options: V8 Northstar engine, V6 High Feature engine Styling: Angular, distinctive Cadillac design language of the era 📋 Manual Details Coverage Areas Coverage: All models, engines, trims, and transmission types for the 2004 Cadillac STS Page Count Page Count: Not Specified (Downloadable format) Manual Type Manual Type: Complete Workshop Service Repair Manual Language Language: English Format Format: Downloadable (PDF compatible) 📖 Manual Coverage Systems Covered Powertrain: Engine mechanical, fuel system, cooling system, lubrication system, exhaust system, engine control systems (ECM/PCM) Transmission: Automatic transmission service, diagnosis, and repair Drivetrain: Front-wheel drive (FWD) and all-wheel drive (AWD) components, driveline, axles, differentials Suspension: Front and rear suspension, struts, shock absorbers, control arms, bushings, alignment specifications Steering: Power steering system, steering rack, tie rods, steering column Brakes: Brake system components (rotors, pads, calipers, lines), ABS, traction control, hydraulic system Electrical: Battery, charging system, starting system, lighting, power windows, power locks, interior electronics, body control modules (BCM) HVAC: Heating, ventilation, and air conditioning systems, refrigerant service Body: Body exterior panels, doors, glass, interior trim, structural components Restraint: Airbag system, seat belts Procedures Included Maintenance: Scheduled maintenance, fluid changes, filter replacements, inspections Diagnostics: Troubleshooting guides, diagnostic trouble codes (DTCs), symptom-based diagnostics Repair: Step-by-step repair procedures for all major vehicle systems Overhaul: Complete engine and transmission overhaul procedures Component Replacement: Replacement of individual components within all systems Wiring Diagrams: Detailed electrical wiring diagrams for all circuits Technical Depth Depth: Comprehensive, from basic maintenance to in-depth engine and transmission rebuilds 📊 Manual Specifications File Format File Format: PDF (Portable Document Format) Print Quality Print Quality: High-quality, printable pages with clear images and text Binding Type Binding Type: Not applicable (downloadable, user prints and binds as needed) Paper Type Paper Type: Not applicable (digital file) ⚙️ Engine Specifications Primary Engine Engine Code V6: L37 (4.6L Northstar V8) and LY7 (3.6L High Feature V6) Performance V6 Horsepower V6: Approximately 275 hp (3.6L V6), 320 hp (4.6L V8 Northstar) Torque V6: Approximately 252 lb-ft (3.6L V6), 300 lb-ft (4.6L V8 Northstar) Fuel System Fuel Delivery: Sequential Multi-Port Fuel Injection (MPI) Engine Components Timing: Dual Overhead Camshafts (DOHC), 4 valves per cylinder, timing chains 🔧 Transmission Standard Transmission Type: 5-speed automatic (5L50-E) Optional AWD Option: Available all-wheel drive (AWD) system Features Transmission Features: Driver Shift Control, adaptive shifting Fluid Specifications Transmission Fluid Type: Dexron VI (or equivalent specification) 📐 Dimensions Exterior Length: Approximately 199.0 inches Width: Approximately 71.9 inches Height: Approximately 57.7 inches Weights Curb Weight Rwd: Approx. 3,800 - 3,950 lbs (V6 RWD) Curb Weight AWD: Approx. 4,000 - 4,150 lbs (V6 AWD) Wheelbase: Approximately 113.4 inches Wheels Tires Wheel Size: Standard 17-inch, optional 18-inch alloy wheels Tire Size Standard: P235/50R17 (may vary by trim/options) Bolt Pattern: 5x115mm 🛡️ Safety Features Ratings NHTSA Front Impact: 5-Star (driver and passenger) NHTSA Side Impact: 5-Star (front and rear passengers) Active Features Traction Control: StabiliTrak electronic stability control system ABS: Anti-lock Braking System (ABS) Passive Features Airbags: Front airbags, side-impact airbags, curtain airbags Seatbelts: Three-point seatbelts with pretensioners 💡 Technology Features Infotainment Infotainment System: Cadillac's infotainment system with options for Bose premium audio, CD player, and available navigation. Driver Assistance Driver Assistance Features: Traction control, StabiliTrak, cruise control Connectivity Connectivity Options: OnStar telematics system (subscription-based) Convenience Features Comfort Features: Heated and ventilated front seats, dual-zone climate control, keyless entry 🔧 Maintenance Service Intervals Oil Change Interval: Every 7,500 miles or 12 months (using synthetic oil, check manual for exact recommendation) Tire Rotation Interval: Every 7,500 miles Coolant Flush Interval: Refer to manual, typically around 60,000 - 100,000 miles for extended life coolant Fluid Specifications Engine Oil Type: SAE 5W-30 Synthetic (check owner's manual for precise API certification) Engine Oil Capacity V6: Approx. 5.5 quarts (4.6L V8), 5.0 quarts (3.6L V6) with filter change Coolant Type: Dex-Cool (Orange) Long Life Coolant (GM specification) Brake Fluid Type: DOT 3 (check manual for any specific GM formulation) Known Issues Northstar V8 Head Gaskets: While less prevalent on later Northstar engines, early models had known issues; this manual will detail checks and repairs. Power Steering Leaks: Potential for leaks in power steering hoses or pump. Suspension Components: Wear on control arm bushings, tie rod ends, and struts common with mileage. PCM Modules: Occasional electronic module failures, particularly the Powertrain Control Module (PCM). 📚 Vehicle History Brand Heritage Cadillac Legacy: Long history of luxury and technological innovation in American automotive manufacturing Model Evolution Sts Debut: Introduced for the 2005 model year, replacing the Seville, this 2004 manual covers the final year of the Seville generation, which the STS is a direct...