The 1999 Buick Riviera is a premium personal luxury coupe designed for consumers seeking comfort, style, and performance. Built on the G-body platform, this model represents the final iteration of the seventh generation Riviera, known for its distinctive styling and advanced technology for its era. It was powered by a potent 3.8L V6 Series II Supercharged engine, delivering 240 horsepower and 280 lb-ft of torque, paired with a smooth 4-speed automatic transmission. With its focus on a refined ride and upscale features, the Riviera competed in a segment with notable luxury coupes of the time, offering a comfortable and well-equipped American-made alternative. This comprehensive factory service manual provides in-depth technical information for the 1999 Buick Riviera. It covers all mechanical, electrical, and body repairs, along with detailed diagnostic and troubleshooting procedures. Essential maintenance schedules, fluid specifications, and component replacement instructions are included, empowering both owners and professional technicians to maintain and repair the vehicle effectively. The manual details engine systems, powertrain, suspension, brakes, electrical systems, climate control, safety restraints, and bodywork, featuring high-quality illustrations and complete wiring schematics to ensure accurate servicing and repair. 🏷️ Basic Information Identification Make: Buick Model: Riviera Year: 1999 Codes Platform Code: G-body (further refinement needed for specific Riviera platform) Engine Code Primary: L36 (3.8L V6 Series II Supercharged) Engine Code Secondary: LG8 (3.8L V6 Naturally Aspirated - less common for '99 Riviera, but possible) 👋 Introduction Market Position Positioning: Premium personal luxury coupe, targeting comfort, style, and performance. Competitive Analysis Competitors: Ford Thunderbird, Chrysler LHS, Lincoln Mark VIII, Cadillac Eldorado. Key Features Design Philosophy: Focus on advanced technology, comfortable ride, and distinctive styling for its era. Target Audience: Consumers seeking a refined, well-equipped, and comfortable American-made coupe. Manual Value Proposition Diy Advantage: Empowers owners to perform their own maintenance and repairs, saving costs and increasing vehicle knowledge. Professional Standard: Provides dealership-level technical information for accurate and efficient servicing. 📋 Manual Details Coverage Areas Diagnostic Procedures: Full A-Z diagnosis and troubleshooting Repair Coverage: All mechanical, electrical, and body repairs Maintenance Coverage: Scheduled maintenance, fluid changes, component replacement Page Count Estimated Page Count: Likely over 1500 pages (typical for comprehensive factory service manuals) Manual Type Type: Factory Service Manual (FSM) / Repair Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine Systems: Engine mechanical, fuel injection, ignition, cooling, lubrication, emissions control Powertrain Systems: Automatic transmission (4T65-E), transfer case (if applicable), drive shafts, differentials, axles Suspension Steering: Front and rear suspension, steering column, power steering system, wheel alignment Braking Systems: Front and rear brakes (disc/drum), ABS control, parking brake system Electrical Systems: Battery, charging system, starting system, lighting, instrumentation, power accessories, multiplex communication (CAN) Climate Control: Air conditioning system, heater, ventilation Safety Restraints: Supplemental Restraint System (SRS) / Airbags, seat belts, engine immobilizer Body Interior: Body panels, doors, locks, windows, mirrors, interior trim, seats, instrument panel Comfort Convenience: Cruise control, wipers, washers, audio/visual systems, horn Procedures Included Engine Repair: Engine overhaul, component replacement (pistons, rings, bearings, valves, seals), timing system Transmission Service: Transmission fluid and filter change, internal component repair, solenoid replacement Brake Service: Brake pad/shoe replacement, rotor/drum resurfacing/replacement, caliper/wheel cylinder service, bleeding procedures Electrical Diagnostics: Wiring schematic interpretation, circuit testing, component diagnosis (sensors, actuators, modules) Suspension Alignment: Component replacement (struts, shocks, ball joints, tie rods), wheel alignment specifications and procedures Air Conditioning Service: Refrigerant handling, component replacement (compressor, condenser, evaporator), leak detection Troubleshooting Guides: Systematic approaches to diagnosing common and complex issues Specifications Data: Torque values, clearances, fluid capacities, electrical values Technical Depth Depth: Factory-level, comprehensive diagnostic and repair procedures Diagnostic Tools: References to factory diagnostic tools (e.g., Tech 2) and procedures Component Rebuild: Detailed instructions for engine and transmission component rebuilding Wiring Schematics: Complete, detailed wiring diagrams for all electrical systems Illustrations Diagrams: High-quality illustrations and exploded views for component identification and assembly 📊 Manual Specifications File Format File Type: PDF Searchability: Likely text-searchable (depending on PDF creation) Print Quality Printability: Yes, all pages are printable Image Resolution: High-resolution for clear viewing and enlarged printing of diagrams Binding Type Binding: Digital (No physical binding) Paper Type Paper Quality Suggestion: Suggests printing on durable, oil-resistant paper for workshop use Compatibility Operating Systems: Windows (Vista 32/64, XP, ME, 98, NT, 2000) and Mac compatible Requirements Software Requirements: Adobe PDF Reader, Winzip (free downloads) ⚙️ Engine Specifications Primary Engine Engine Name: 3.8L V6 Series II Supercharged Engine Type: Overhead Valve (OHV) V6 Displacement: 3791 cc (231 cubic inches) Bore X Stroke: 3.80 x 3.38 inches (96.5 x 86.0 mm) Compression Ratio: 9.5:1 Horsepower: 240 hp @ 4400 rpm Torque: 280 lb-ft @ 3600 rpm Fuel System Fuel Delivery: Sequential Multi-Port Fuel Injection (MFI) with Supercharger Fuel Type: Premium Unleaded Gasoline (91 octane recommended) Cooling System Cooling Capacity: Approx. 13.5 US quarts (12.8 Liters) Lubrication Oil Capacity: Approx. 4.5 US quarts (4.3 Liters) with...