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Introduction
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Market
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Market Position:
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A comprehensive repair and service manual for owners and independent mechanics seeking to maintain, diagnose, and repair the 1979 Audi 100 and 200 models. Targets DIY enthusiasts and professional service providers.
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Competition
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Competitive Analysis:
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Provides factory-level technical data, often superior to generic repair guides. Offers step-by-step instructions and diagrams that are crucial for accurate repairs, setting it apart from less detailed resources.
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Features
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Key Features:
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Detailed diagrams, illustrations, wiring schematics, specifications, step-by-step instructions, troubleshooting, and factory-level repair procedures. Empowers owners for self-maintenance and informed communication with technicians.
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Value Proposition
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Owner Benefit:
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Empowers owners with the knowledge to perform maintenance, saving money on labor costs and fostering a deeper understanding of their vehicle's mechanics. Also aids in informed decision-making when consulting professional mechanics.
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Target Audience
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Audience Types:
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Audi owners, classic car enthusiasts, independent automotive technicians, DIY mechanics, and repair shops specializing in vintage European vehicles.
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Manual Coverage
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Scope
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Systems Covered:
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All major automotive systems including engine, drivetrain, chassis, brakes, steering, suspension, electrical, body, and HVAC.
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Procedures
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Procedures Included:
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Step-by-step repair and service instructions, troubleshooting guides, diagnostic procedures, maintenance tasks, wiring schematics, component replacement, and system adjustments.
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Included Procedures:
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Engine tune-ups, oil changes, filter replacements, fluid level checks and top-offs, brake system bleeding, tire rotation, spark plug replacement, and basic diagnostic checks.
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Advanced Procedures:
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Engine rebuilds, transmission overhauls, suspension component replacement, brake caliper rebuilding, electrical troubleshooting using schematics, and bodywork repair.
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Depth
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Technical Depth:
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Comprehensive, detailed, and vehicle-specific, covering basic maintenance to complex overhauls. Equivalent to factory-authorized dealer service information.
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Systems Covered
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Engine Mechanical:
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Detailed coverage of engine components, including cylinder head, block, pistons, crankshaft, camshaft, valves, timing belts/chains, lubrication system, and cooling system.
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Engine Electrical:
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Complete electrical system diagnostics, including starter motor, alternator, ignition system, lighting, gauges, and accessory circuits. Extensive wiring diagrams are provided.
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Fuel System:
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Carburetor or fuel injection system troubleshooting, adjustment, and overhaul. Fuel pump, fuel lines, and fuel tank servicing.
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Drivetrain:
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Manual and automatic transaxle overhaul, clutch system replacement, driveshaft inspection and repair, CV joint servicing, and axle shaft procedures.
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Suspension Steering:
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Front and rear suspension component diagnosis and replacement (struts, shocks, control arms, bushings), power steering system servicing, and wheel alignment specifications.
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Brakes:
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Disc and drum brake system overhaul, hydraulic system bleeding, brake pad/shoe replacement, caliper and master cylinder servicing, and parking brake adjustments.
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Body Interior Exterior:
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Body panel repair, door mechanisms, window regulators, interior trim removal and installation, seat adjustments, and external trim components.
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Body Electrical:
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Comprehensive coverage of the body's electrical systems, including interior and exterior lighting, power windows, central locking (if equipped), dashboard instruments, and warning lights.
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Emission Control:
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Details on emission control systems, including catalytic converters (if applicable), exhaust gas recirculation (EGR), and related sensors and vacuum lines for compliance with regulations of the era.
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Restraint System:
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Focus on seatbelt operation, adjustment, and any associated components related to occupant restraint. Airbags were not prevalent in this era.
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HVAC:
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In-depth coverage of the heating, ventilation, and air conditioning systems, including blower motor, heater core, evaporator, refrigerant circuits, and control mechanisms.
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Technical Depth
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Diagnostic Tools:
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While the manual itself doesn't include tools, it implicitly guides the user on the necessary tools for each procedure, from basic wrenches to specialized diagnostic equipment if applicable to the era.
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Specifications Data:
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Includes critical specifications such as torque values for fasteners, engine timing settings, fuel mixture adjustments, valve clearances, brake rotor runout, and wheel alignment angles.
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Maintenance
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Service Intervals
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Oil Change Interval:
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Typically every 5,000-7,500 miles (8,000-12,000 km) or 6-12 months, depending on driving conditions. Specific recommendations are in the manual.
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Tune Up Interval:
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Spark plug replacement, distributor cap, rotor, and ignition wire checks usually recommended every 20,000-30,000 miles (32,000-48,000 km).
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Fluid Specifications
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Engine Oil Type:
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Likely API SE or SF rated multi-grade oil, such as 10W-40 or 20W-50, depending on climate. Refer to manual for exact specifications and viscosity grades.
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Coolant Type:
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Ethylene glycol-based antifreeze mixed with distilled water (50/50 ratio). Manual will specify type and capacity.
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Transmission Fluid Manual:
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Gear oil, type and viscosity (e.g., GL-4 75W-90 or similar) will be specified. Capacity typically around 1.8-2.0 liters.
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Transmission Fluid Automatic:
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Dexron III or equivalent Automatic Transmission Fluid (ATF). Capacity typically around 3.5-4.5 liters.
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Brake Fluid Type:
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DOT 3 or DOT 4 hydraulic brake fluid.
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Power Steering Fluid:
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If equipped with power steering, the manual will specify the correct fluid type, usually a dedicated power steering fluid or ATF.
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Washer Fluid:
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Standard automotive windshield washer fluid.
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Known Issues
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Common Problems:
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Potential issues can include carburetor wear, fuel delivery problems (especially with K-Jetronic), CV joint wear, suspension bushing degradation, electrical connector corrosion, and aging rubber seals/hoses. The manual provides diagnostic steps for these.
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Electrical Aging:
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Aging wiring harnesses, brittle insulation, and corroded connectors are common in vehicles of this age. The manual's schematics are crucial for diagnosing and repairing these issues.
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Fluid Capacities
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Engine Oil Capacity:
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Typically around 4.0-4.5 liters (4.2-4.8 US quarts) for the inline-5 engine. Exact capacity confirmed in the manual.
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Vehicle History
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Brand Heritage
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Brand History:
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Audi, a German automobile manufacturer, has a history of innovation and premium engineering, dating back to the early 20th century. Known for advanced technology and sophisticated design.
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Model Evolution
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Audi 100 Generation:
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This manual covers the Audi 100 C3 generation, which debuted in 1976 (Europe) and 1977 (North America), and the subsequent 200 variant, representing Audi's push into the executive car market with front-wheel drive and aerodynamic designs.
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Audi 200 Positioning:
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The Audi 200 was typically positioned as a more luxurious and powerful variant of the Audi 100, often featuring more premium appointments and potentially larger engines or turbocharging, though specific 1979 configurations should be verified within the manual.
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Design Philosophy:
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The C3 generation represented a significant step in Audi's design language, emphasizing aerodynamic efficiency and a clean, modern aesthetic, a departure from earlier, more angular designs.
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Production
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Production Period:
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The C3 generation (which includes the 1979 models) was produced from 1976 to 1982 in its initial form, with updates and evolutions continuing thereafter.
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