Buick Century 1997-2005 Factory Workshop Service Repair Manual

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The Buick Century, produced for the 1997 through 2005 model years, is a mid-size sedan known for its comfortable ride, spacious interior, and practical appeal. Built on the versatile GM W-body platform, this generation of the Century offered a range of powertrain options, including efficient 2.2L four-cylinder engines and powerful 3.1L and 3.8L V6 engines, all paired with automatic transmissions. Its design focused on providing a smooth and quiet driving experience, making it a popular choice for everyday transportation and longer journeys. Notable features included available luxury enhancements and a user-friendly control layout, reflecting Buick's commitment to comfort and reliability. This comprehensive Factory Workshop Service Repair Manual provides detailed information for the maintenance, diagnosis, and repair of your Buick Century. Spanning over 5000 pages, it covers all essential vehicle systems for model years 1997-2005, including engine mechanicals, HVAC, brakes, suspension, steering, drivetrain, and extensive electrical systems. The manual offers step-by-step repair procedures, troubleshooting guides, diagnostic flowcharts, technical specifications, and high-resolution illustrations, enabling owners and technicians to perform everything from routine maintenance to complex repairs accurately and efficiently. 🏷️ Basic Information Identification Make: Buick Model: Century Model Generation: 3rd Generation (1997-2005) Chassis Code: W-Body Codes Platform: GM W-body platform 👋 Introduction Market Position Market Position: The Buick Century was positioned as a comfortable, reliable, and affordable mid-size sedan, appealing to a broad demographic seeking practical transportation. Competitive Analysis Competitive Analysis: Competed against vehicles like the Ford Taurus, Toyota Camry, Honda Accord, and Chevrolet Lumina, focusing on comfort and a refined ride over sporty dynamics. Key Features Key Features: Spacious interior, comfortable ride quality, V6 engine options, user-friendly controls, and the availability of a 'Touring' trim for enhanced luxury features. 📋 Manual Details Coverage Areas Covered Years: 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005 Page Count Page Count: 5000+ Manual Type Manual Type: Factory Workshop Service Repair Manual Language Language: English Format Format: PDF Compatibility: Windows & Mac (all versions), Tablets, Phones (32/64-bit) File Access: Can be read directly from CD or copied to hard drive for offline access. Portability: Windows/Mac/Tablet/Phone Friendly 📖 Manual Coverage Systems Covered Systems Covered 1997-2002: 2.2L Engine, 3.1L Engine, HVAC, Brakes (including Antilock Brakes), Suspension (Front & Rear), Steering (Power & Variable), Drivetrain (Axle Shafts, Wheel Drive Shafts), Electrical Systems (Airbags, Alternator, Starter, Cruise Control, Fuses, Horns, Keyless Entry, Power Door Locks, Power Mirrors, Power Seats, Power Windows, Sunroof, Trunk Release, Wiper/Washer), Cooling System, Exhaust System, Exterior Trim, Cabin Air Filter, Computer Relearn, Self Diagnostic, System Component Tests, Vacuum Diagrams, Wheel Alignment Systems Covered 2003-2005: 3.1L Engine, 3.8L Engine, HVAC (with Troubleshooting), Brakes (Disc/Drums, Antilock Brakes), Suspension (Front & Rear), Steering (Power), Drivetrain (Axle Shafts), Electrical Systems (Airbags, Alternator, Starter, Cruise Control, Fuses, Horns, Keyless Entry, Lighting, Power Steering, Sunroof, Wiper/Washer), Cooling System, Exhaust System, Frame/Underbody, Doors, Drive Belt Routing, Electric Cooling Fans, Entertainment Systems, Interior Trim, Cabin Air Filter, Computer Relearn Engine Coverage 1997-2002: 2.2L L4, 3.1L V6: Engine mechanical, lubrication, cooling, fuel delivery, ignition, exhaust, emissions, engine control systems. Engine Coverage 2003-2005: 3.1L V6, 3.8L V6: Engine mechanical, lubrication, cooling, fuel delivery, ignition, exhaust, emissions, engine control systems. Transmission Coverage: Automatic transmission service, diagnosis, repair, torque converter, seals, internal components, external linkages. Brakes Coverage: Disc and drum brake service, hydraulic system, parking brake, ABS system components and diagnosis, wheel speed sensors, control modules. Electrical Coverage 1997-2002: Wiring diagrams for all systems, component location, charging system, starting system, lighting, instruments, body controls (power windows, locks, seats, mirrors), HVAC controls, cruise control, airbags, anti-theft systems. Electrical Coverage 2003-2005: Wiring diagrams for all systems, component location, charging system, starting system, lighting, instruments, body controls (power windows, locks, seats, mirrors), HVAC controls, cruise control, airbags, entertainment systems, keyless entry. Procedures Included Procedures Included: Detailed service and repair instructions, troubleshooting guides, component testing, diagnostic procedures, maintenance schedules, system component tests, electrical component location, wiring diagrams, vacuum diagrams, computer relearn procedures, maintenance light reset Diagnostic Procedures: OBD-II fault code retrieval and interpretation, component testing using multimeter and specialized tools, diagnostic flowcharts, troubleshooting guides for specific symptoms. Maintenance Procedures: Routine maintenance tasks: oil changes, filter replacements, fluid checks and top-offs, belt inspections and replacement, spark plug replacement, battery maintenance. Repair Procedures: Step-by-step instructions for component removal, installation, and repair for all major vehicle systems. Technical Specifications: Torque specifications for all fasteners, electrical specifications, diagnostic parameter values, component specifications. Technical Depth Technical Depth: Comprehensive from basic maintenance to complete engine and transmission rebuilds, including detailed electrical diagnostics and bodywork procedures. 📊 Manual Specifications File Format File Format: PDF Print Quality Print Quality: High Resolution Illustrations, Photos, and Diagrams Binding Type Binding Type: Digital (Printable directly from CD/download) Paper Type Paper Type: N/A (Digital Format) ⚙️ Engine Specifications Primary Engine Primary Engine 1997-2002: 2.2L L4 (2198cc) Generation II 'Quad-4' OHV (often designated as the L61), 115-125 hp @ 5000 rpm, 130-145 lb-ft...

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Description

🏷️ Basic Information

Identification

Make:

Buick

Model:

Century

Model Generation:

3rd Generation (1997-2005)

Chassis Code:

W-Body

Codes

Platform:

GM W-body platform

👋 Introduction

Market Position

Market Position:

The Buick Century was positioned as a comfortable, reliable, and affordable mid-size sedan, appealing to a broad demographic seeking practical transportation.

Competitive Analysis

Competitive Analysis:

Competed against vehicles like the Ford Taurus, Toyota Camry, Honda Accord, and Chevrolet Lumina, focusing on comfort and a refined ride over sporty dynamics.

Key Features

Key Features:

Spacious interior, comfortable ride quality, V6 engine options, user-friendly controls, and the availability of a 'Touring' trim for enhanced luxury features.

📋 Manual Details

Coverage Areas

Covered Years:

1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005

Page Count

Page Count:

5000+

Manual Type

Manual Type:

Factory Workshop Service Repair Manual

Language

Language:

English

Format

Format:

Compatibility:

Windows & Mac (all versions), Tablets, Phones (32/64-bit)

File Access:

Can be read directly from CD or copied to hard drive for offline access.

Portability:

Windows/Mac/Tablet/Phone Friendly

📖 Manual Coverage

Systems Covered

Systems Covered 1997-2002:

2.2L Engine, 3.1L Engine, HVAC, Brakes (including Antilock Brakes), Suspension (Front & Rear), Steering (Power & Variable), Drivetrain (Axle Shafts, Wheel Drive Shafts), Electrical Systems (Airbags, Alternator, Starter, Cruise Control, Fuses, Horns, Keyless Entry, Power Door Locks, Power Mirrors, Power Seats, Power Windows, Sunroof, Trunk Release, Wiper/Washer), Cooling System, Exhaust System, Exterior Trim, Cabin Air Filter, Computer Relearn, Self Diagnostic, System Component Tests, Vacuum Diagrams, Wheel Alignment

Systems Covered 2003-2005:

3.1L Engine, 3.8L Engine, HVAC (with Troubleshooting), Brakes (Disc/Drums, Antilock Brakes), Suspension (Front & Rear), Steering (Power), Drivetrain (Axle Shafts), Electrical Systems (Airbags, Alternator, Starter, Cruise Control, Fuses, Horns, Keyless Entry, Lighting, Power Steering, Sunroof, Wiper/Washer), Cooling System, Exhaust System, Frame/Underbody, Doors, Drive Belt Routing, Electric Cooling Fans, Entertainment Systems, Interior Trim, Cabin Air Filter, Computer Relearn

Engine Coverage 1997-2002:

2.2L L4, 3.1L V6: Engine mechanical, lubrication, cooling, fuel delivery, ignition, exhaust, emissions, engine control systems.

Engine Coverage 2003-2005:

3.1L V6, 3.8L V6: Engine mechanical, lubrication, cooling, fuel delivery, ignition, exhaust, emissions, engine control systems.

Transmission Coverage:

Automatic transmission service, diagnosis, repair, torque converter, seals, internal components, external linkages.

Brakes Coverage:

Disc and drum brake service, hydraulic system, parking brake, ABS system components and diagnosis, wheel speed sensors, control modules.

Electrical Coverage 1997-2002:

Wiring diagrams for all systems, component location, charging system, starting system, lighting, instruments, body controls (power windows, locks, seats, mirrors), HVAC controls, cruise control, airbags, anti-theft systems.

Electrical Coverage 2003-2005:

Procedures Included

Procedures Included:

Detailed service and repair instructions, troubleshooting guides, component testing, diagnostic procedures, maintenance schedules, system component tests, electrical component location, wiring diagrams, vacuum diagrams, computer relearn procedures, maintenance light reset

Diagnostic Procedures:

OBD-II fault code retrieval and interpretation, component testing using multimeter and specialized tools, diagnostic flowcharts, troubleshooting guides for specific symptoms.

Maintenance Procedures:

Routine maintenance tasks: oil changes, filter replacements, fluid checks and top-offs, belt inspections and replacement, spark plug replacement, battery maintenance.

Repair Procedures:

Step-by-step instructions for component removal, installation, and repair for all major vehicle systems.

Technical Specifications:

Torque specifications for all fasteners, electrical specifications, diagnostic parameter values, component specifications.

Technical Depth

Technical Depth:

Comprehensive from basic maintenance to complete engine and transmission rebuilds, including detailed electrical diagnostics and bodywork procedures.

📊 Manual Specifications

File Format

File Format:

Print Quality

Print Quality:

High Resolution Illustrations, Photos, and Diagrams

Binding Type

Binding Type:

Digital (Printable directly from CD/download)

Paper Type

Paper Type:

N/A (Digital Format)

⚙️ Engine Specifications

Primary Engine

Primary Engine 1997-2002:

2.2L L4 (2198cc) Generation II 'Quad-4' OHV (often designated as the L61), 115-125 hp @ 5000 rpm, 130-145 lb-ft torque @ 3600-4000 rpm.

Primary Engine 1997-2005:

3.1L V6 (3097cc) GM '3100' SFI OHV, 155-170 hp @ 5200 rpm, 185-195 lb-ft torque @ 4000 rpm.

Primary Engine 2003-2005:

3.8L V6 (3791cc) GM '3800' Series I/II OHV, 170-205 hp @ 4800-5200 rpm, 220-240 lb-ft torque @ 3200-3600 rpm.

Performance

Performance Note:

Performance varied by engine and model year, with the 3.8L V6 offering the best acceleration and passing power.

Fuel System

Fuel System:

Sequential Fuel Injection (SFI)

Engine Codes

Engine Codes:

2.2L: L61 (GM Ecotec family introduction); 3.1L: 3100 V6; 3.8L: 3800 V6.

🔧 Transmission

Standard

Transmission Standard 1997-2005:

4-speed Automatic Transmission (e.g., 4T60-E/4T65-E)

Optional

Transmission Optional:

No manual transmission option was available for the Buick Century in these model years.

Features

Transmission Features:

Electronically controlled, overdrive, torque converter lock-up for improved fuel efficiency.

📐 Dimensions

Exterior

Exterior Length:

Approximately 196.5 inches (1997-2005 models)

Exterior Width:

Approximately 70.5 inches (1997-2005 models)

Exterior Height:

Approximately 55.5 inches (1997-2005 models)

Weights

Curb Weight:

Approx. 3200-3400 lbs (depending on engine and trim)

Gross Vehicle Weight Rating:

Approx. 4400 lbs

🛡️ Safety Features

Ratings

NHTSA Front Impact Driver:

Good (1997-2002 models often received 'Good' ratings in frontal impacts)

NHTSA Front Impact Passenger:

Good (1997-2002 models often received 'Good' ratings in frontal impacts)

IIHS Offset Frontal Impact:

Acceptable to Good (depending on specific test year)

Active Features

Active Safety Features:

Antilock Braking System (ABS) standard on most trims, Traction Control (optional on some models), Daytime Running Lamps (DRLs) on later models.

Passive Features

Passive Safety Features:

Dual front airbags, side-impact airbags (optional on some models), front and rear crumple zones, LATCH child seat anchors (introduced during this generation).

💡 Technology Features

Infotainment

Infotainment Features:

Aftermarket radio installations common; factory units typically included AM/FM stereo, cassette player, and optional CD player. Basic climate controls, manual or automatic temperature control for HVAC.

Driver Assistance

Driver Assistance Features:

Cruise control, optional traction control (on 3.8L models), optional power adjustable pedals (on some later models).

Connectivity

Connectivity Features:

Keyless entry system, power accessories (locks, mirrors, windows, seats).

🔧 Maintenance

Service Intervals

Oil Change Interval:

Typically every 5,000-7,500 miles or 6 months, using synthetic blend or full synthetic oil as recommended.

Coolant Flush Interval:

Every 30,000-60,000 miles or 2-4 years, depending on coolant type.

Spark Plug Replacement:

100,000 miles for platinum or iridium spark plugs, 30,000 miles for standard plugs (if applicable).

Fluid Specifications

Engine Oil Specification:

SAE 5W-30 or 10W-30 (check owner's manual for specific engine and temperature range requirements).

Transmission Fluid Specification:

Dexron-III (or Dexron-VI as a superseding fluid).

Coolant Specification:

GM P/N 12346710 (orange silicate-free coolant) or equivalent Dex-Cool compatible antifreeze.

Power Steering Fluid:

GM P/N 12345567 (or equivalent Dexron-VI ATF).

Brake Fluid:

DOT 3.

Known Issues

Common Issues Engine 2.2L:

Oil leaks from front crank seal, intake manifold gasket failures, head gasket issues on some 'Quad-4' variants, carbon buildup.

Common Issues Engine 3.1L/3.8L V6:

Intake manifold gasket leaks (especially the composite gaskets), power steering pump leaks, alternator failures, PCV valve issues.

Common Issues Transmission:

Transmission solenoid failures, torque converter shudder, slow shifting, transmission fluid leaks.

Common Issues Suspension Steering:

Worn strut mounts, control arm bushings, ball joints, power steering fluid leaks, 'death wobble' or steering shimmy.

Common Issues Electrical:

Window regulator failures, power lock actuator failures, HVAC blower motor resistor failures, dashboard warning light illumination (e.g., ABS, Check Engine), keyless entry system malfunctions.

Common Issues Chassis:

Rattles and squeaks from interior trim panels, issues with power antenna (if equipped), door lock actuator failures.

📚 Vehicle History

Brand Heritage

Brand Heritage:

Buick, a division of General Motors, has a long history of producing comfortable, well-appointed, and reliable American sedans.

Model Evolution

Model Evolution:

The 1997-2005 Buick Century represented the third generation of the Century nameplate, built on the updated GM W-body platform. It offered a more aerodynamic design, improved safety features, and updated powertrain options compared to its predecessors.

Model Changes 1997:

Significant redesign from previous generation, featuring new styling, improved chassis dynamics, and updated powertrains. Introduction of the 2.2L L4 engine.

Model Changes 2000:

Minor cosmetic updates and feature enhancements for the 2000 model year.

Model Changes 2003:

Introduction of the more powerful 3.8L V6 engine as an option, replacing the 2.4L DOHC in some configurations. Styling tweaks and interior material updates.

Production

Production Location:

Oshawa Car Assembly, Oshawa, Ontario, Canada; Fairfax Assembly, Kansas City, Kansas, USA.

Production Years:

1997-2005 (for this generation)

🏆 Awards & Recognition

Recognitions

Award Note:

While the Buick Century itself didn't receive major 'car of the year' awards, it was consistently praised for its comfortable ride and value in its segment by automotive critics and consumers.