🏷️ Basic Information Identification Make: Cadillac Model: STS Model Years Covered: 1998, 1999, 2000, 2001, 2002, 2003, 2004 Codes Platform Code: GM G platform (1997-2004) 👋 Introduction Market Position Vehicle Segment: Full-size Luxury Sedan Cadillac Positioning: Cadillac's flagship sedan, competing with German luxury marques Competitive Analysis Key Competitors: BMW 7 Series, Mercedes-Benz S-Class, Lexus LS, Audi A8 Key Features Vehicle Usp: Spacious interior, comfortable ride, powerful V8 engines, advanced (for its time) technology, distinctive American luxury styling Manual Value Proposition Value For Owner: Enables owners to perform maintenance and repairs themselves, saving on labor costs and extending vehicle life. Value For Technician: Provides the authoritative factory information required for accurate diagnosis and repair. 📋 Manual Details Coverage Areas Diagnostic Troubleshooting: Comprehensive Maintenance Procedures: Full Repair Operations: All Specifications: All Technical Page Count Estimated Pages: Hundreds (exact count not specified, but indicated as extensive) Manual Type Type: Factory Service Manual / Workshop Manual Language Primary Language: English Format Digital Format: PDF Download 📖 Manual Coverage Systems Covered Powertrain: Engine mechanical, engine performance, fuel system, exhaust system, engine management (ECM), ignition system, lubrication system, cooling system Transmission Drivetrain: Automatic transmission (4T80-E), transaxle, drivetrain components, drive shafts, differentials Chassis: Suspension (front and rear), steering system, braking system (ABS, traction control), wheels and tires Electrical Electronics: Body control module (BCM), powertrain control module (PCM), lighting systems, instrument cluster, HVAC controls, infotainment system, power accessories, anti-theft system, diagnostic connectors, wiring diagrams Body Interior: Body construction, exterior trim, interior trim, seats, airbags, doors, windows, locks, HVAC system, body sealing Procedures Included Scheduled Maintenance: Oil changes, filter replacements, fluid checks and top-offs, inspections Engine Repair: Engine overhaul, cylinder head removal/installation, piston and connecting rod service, crankshaft service, valve train service Transmission Repair: Transmission diagnosis, fluid and filter service, internal component repair and replacement Suspension Steering Repair: Shock absorber/strut replacement, ball joint and control arm service, power steering pump and rack replacement Brake System Repair: Brake pad/rotor replacement, caliper service, brake line replacement, bleeding procedures, ABS component diagnosis Electrical Diagnostics: Circuit testing, sensor diagnostics, module replacement and programming, wiring harness repair Troubleshooting: Systematic diagnostic flowcharts, symptom-based troubleshooting guides, DTC (Diagnostic Trouble Code) explanations and solutions Technical Depth Depth: Comprehensive Factory Level Detail Level: Step-by-step instructions with detailed photos and diagrams, exploded views 📊 Manual Specifications File Format Compatibility: Windows and MAC OS Accessibility: Printable (single page or entire manual), Usable on multiple devices/computers Print Quality Quality: High-resolution (implied by 'detailed photos & diagrams') Binding Type Digital Binding: N/A (Downloadable PDF) Paper Type Digital Paper: N/A (Digital format) ⚙️ Engine Specifications Primary Engine Engine Code: L37 (Northstar V8) Engine Type: 4.6L DOHC 32-valve V8 Bore X Stroke: 93.0 mm x 84.0 mm Compression Ratio: 10.0:1 Performance Horsepower L37: 275 hp @ 6000 rpm Torque L37: 300 lb-ft @ 4000 rpm Optional Engine Engine Code: LD8 (Northstar V8) Engine Type: 4.6L DOHC 32-valve V8 (lower output version) Horsepower Ld8: 270 hp @ 6000 rpm Torque Ld8: 292 lb-ft @ 4000 rpm Fuel System Fuel Delivery: Sequential Port Fuel Injection (SFI) Fuel Type: Premium Unleaded Gasoline (91 octane or higher recommended) Engine Management ECM Type: GM Powertrain Control Module (PCM) 🔧 Transmission Standard Transmission Type: 4-speed Automatic Transaxle (4T80-E) Drive Configuration: Front-Wheel Drive (FWD) Features Transmission Features: Driver-Shift Control (modes like 'Tour' and 'Sport'), electronic controls 📐 Dimensions Exterior Length: 199.7 inches Width: 73.6 inches Height: 57.0 inches Wheelbase: 115.3 inches Weights Curb Weight L37: ~3900 - 4000 lbs (approximate, varies by trim and options) 🛡️ Safety Features Ratings NHTSA Front Impact: 4-star (Driver), 5-star (Passenger) - 1998 model tested IIHS Side Impact: Good (for models equipped with side airbags) Active Features ABS: Standard Anti-lock Braking System (ABS) Traction Control: Standard Traction Control System (TCS) Passive Features Airbags: Dual front airbags, optional side-impact airbags Seat Belts: 3-point front and rear seat belts with pretensioners 💡 Technology Features Infotainment Infotainment System: CD player, cassette deck (optional), AM/FM stereo, premium sound system options (e.g., Bose) Driver Assistance Driver Assistance Features: StabiliTrak (optional electronic stability control on some models), cruise control Connectivity Connectivity Features: OnStar telematics system (optional, subscription-based service) Convenience Convenience Features: Dual-zone climate control, power adjustable seats, heated seats, memory seats, keyless entry 🔧 Maintenance Service Intervals Oil Change Interval: Typically 3,000-7,500 miles or 3-6 months, depending on driving conditions and oil type (refer to manual for specific recommendations). Coolant Flush Interval: Every 30,000-50,000 miles or 2-3 years (Dex-Cool recommended). Transmission Fluid Change: Inspect every 30,000 miles, change fluid and filter as needed (often around 50,000-100,000 miles for severe service). Fluid Specifications Engine Oil Type: SAE 5W-30 Synthetic (GM spec 4718M) Engine Oil Capacity: 4.5 US quarts (4.3 liters) with filter (verify in manual) Coolant Type: GM Original Equipment (GM6247M) Dex-Cool, extended life coolant Transmission Fluid Type: Dexron III (or compatible Dexron VI) Known Issues Northstar Head Gasket: Premature failure of head...