The 2004 Regal is a mid-size sedan from the sixth generation of the model, built on the versatile W-body platform shared with other General Motors vehicles. Known for its blend of comfort, quiet operation, and performance, particularly with the available supercharged 3.8L V6 engine, the Regal offered a compelling value proposition in its segment. This generation emphasized a sportier driving experience and more aggressive styling, making it a popular choice for individuals seeking reliable transportation with an upscale feel and robust power. The vehicle was assembled in Oshawa, Ontario, Canada, and received strong safety ratings, including 5 stars in frontal crash tests from NHTSA. This comprehensive service and repair manual software provides detailed information for the 2004 Regal, with coverage extending to major systems common across the 2000-2004 W-body platform. It covers engine mechanicals, performance, transmission, brakes, suspension, steering, electrical systems, HVAC, body, and restraint systems. The manual includes essential procedures for routine maintenance, diagnostics, troubleshooting, and component repair or rebuilding, offering OE-level technical depth with step-by-step instructions, specifications, and wiring diagrams. This resource is designed to assist owners and technicians in effectively maintaining and repairing the vehicle. 🏷️ Basic Information Identification Make: Buick Model: Regal Year: 2004 Codes Chassis Code: W-Body Generation Generation Name: Sixth Generation (L67/GM 3800 Series III) Generation Years: 2000-2004 👋 Introduction Market Position Segment: Mid-size Sedan Target Audience: Individuals seeking reliable transportation with a touch of luxury and performance, and DIY mechanics. Competitive Analysis Key Competitors: Ford Taurus, Toyota Camry, Honda Accord, Chrysler Sebring, Dodge Intrepid. Key Features Powertrain Options: Known for its supercharged 3800 Series III V6 engine option. Platform Shared: Shares the W-body platform with other GM vehicles like Chevrolet Impala and Monte Carlo. Value Proposition: Offers a blend of comfort, performance (especially with the supercharged engine), and durability, often at a competitive price point. 📋 Manual Details Coverage Areas Primary Coverage: 2004 Buick Regal Secondary Coverage Notes: Likely covers major systems and components common across the 2000-2004 Regal W-body platform, with specific emphasis on 2004 updates. Page Count Estimated Page Count: Extensive (typical for a comprehensive OE-derived service manual, often 1000+ pages in printed equivalent) Manual Type Type: Service and Repair Manual Software Language Language: English Format Format: PDF Download (accessible via web browser) 📖 Manual Coverage Systems Covered Engine Mechanical: Engine assembly, cylinder heads, pistons, crankshaft, camshaft, valve train, timing, lubrication, cooling. Engine Performance: Fuel injection, ignition system, emissions control, diagnosis and testing. Transmission Drivetrain: Automatic transmission (e.g., 4T65-E), torque converter, differentials, drive axles, transfer case (if applicable). Brakes: Hydraulic system, ABS, electronic brake control, brake rotors, pads, calipers, lines, parking brake. Suspension Steering: Front suspension, rear suspension, struts, shocks, control arms, ball joints, steering gear, power steering system, wheel alignment. Electrical Electronics: Battery, charging system, starting system, lighting, instrument panel, body control modules, infotainment, wiring diagrams. Heating Air Conditioning: HVAC system, climate control, refrigerant handling, compressor, evaporator, heater core. Body Chassis: Body structure, doors, windows, seats, bumpers, exterior trim, interior trim, corrosion protection. Restraints: Airbag system, seat belts, SRS module. Procedures Included Maintenance: Routine maintenance, oil changes, filter replacements, fluid checks and changes, spark plug replacement, belt replacement. Diagnostics Troubleshooting: Systematic fault finding, diagnostic trouble codes (DTCs), symptom analysis, component testing. Repair Rebuild: Component removal and installation, engine rebuild procedures, transmission overhaul, brake caliper replacement, suspension component replacement. Electrical Diagnostics: Reading wiring diagrams, testing electrical components, circuit tracing, module diagnostics. Technical Depth Depth: Comprehensive OE-level detail, suitable for professional technicians and experienced DIY enthusiasts. Detail Level: Step-by-step repair instructions, torque specifications, special tool requirements, diagnostic procedures, and specifications. 📊 Manual Specifications File Format Format: PDF Quality: High-resolution, professionally scanned or digitally generated, allowing for clear viewing and printing. Searchability: Likely includes searchable text for quick information retrieval. Print Quality Printability: Designed to be printable, allowing users to create physical copies of specific sections. Binding Type Binding: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Code Typical: L36 (3.8L naturally aspirated V6) or L67 (3.8L supercharged V6) Displacement Liter: 3.8 Cylinders: 6 Configuration: V-engine Aspirated Type: Naturally Aspirated or Supercharged Performance Horsepower L36: Approx. 200 hp @ 5200 rpm Torque L36: Approx. 225 lb-ft @ 4000 rpm Horsepower L67: Approx. 240 hp @ 5200 rpm Torque L67: Approx. 280 lb-ft @ 3600 rpm Fuel System Fuel Delivery: Multi-port Fuel Injection (MPFI) Fuel Type: Unleaded Gasoline 🔧 Transmission Standard Type: 4-speed Automatic Model Code: 4T65-E Optional Type: N/A (Typically only automatic was offered for this generation Regal) Features Overdrive: Yes, 4th gear is overdrive Drive Wheels: Front-Wheel Drive (FWD) 📐 Dimensions Exterior Length: Approx. 196.3 inches Width: Approx. 71.4 inches Height: Approx. 55.9 inches Wheelbase: Approx. 109.0 inches Weights Curb Weight Est: 3500-3700 lbs (depending on trim and options) 🛡️ Safety Features Ratings NHTSA Frontal Driver 2004: 5 Stars NHTSA Frontal Passenger 2004: 5...