🏷️ Basic Information

Make:

HUMMER

Model:

H1

Year:

2004

Chassis Code:

H1 Alpha

Oem Manual Code:

Not specified, but typical of dealer-level technical publications

👋 Introduction

Vehicle Segment:

High-mobility multi-purpose wheeled vehicle (HMMWV derivative), off-road SUV.

Target Audience For Manual:

HUMMER H1 owners, independent repair shops, automotive technicians, and enthusiasts seeking in-depth knowledge.

Comparative Advantage Of Manual:

Provides dealership-level technical information, often unavailable to the general public, enabling complex repairs and maintenance.

Key Selling Points Of Manual:

Comprehensive coverage, detailed illustrations, electrical schematics, diagnostic codes, step-by-step instructions, PDF format for easy access.

📋 Manual Details

Systems Covered:

Engine, Drivetrain, Suspension, Steering, Brakes, HVAC, Electrical Systems, Body, Chassis, Fuel System, Cooling System, Exhaust System, Diagnostic Codes, Wiring Schematics, Interior Components

Approximate Page Count:

Varies by specific vehicle configuration, typically 1000+ pages for a complete workshop manual

Manual Type:

Workshop Service Repair Manual

Language:

English

Format:

PDF

📖 Manual Coverage

Engine Service And Repair:

Detailed procedures for all major engine components, including disassembly, inspection, repair, and reassembly.

Transmission Service And Repair:

Comprehensive coverage for both automatic and manual transmissions, including torque converters, clutch packs, gear sets, and valve bodies.

Drivetrain And Axles:

Maintenance and repair of front and rear axles, differentials, CV joints, driveshafts, and transfer case.

Suspension And Steering:

Detailed information on independent front and rear suspension systems, steering gear, power steering pump, linkages, and alignment procedures.

Brake System:

Service and repair for hydraulic brake systems, including master cylinder, calipers, rotors, brake pads, ABS components, and parking brake.

Heating Ventilation And Air Conditioning HVAC:

Diagnosis and repair of the A/C system, heater core, blower motor, refrigerant lines, and climate control module.

Electrical Systems:

Complete electrical troubleshooting, including battery, charging system, starting system, lighting, ignition system, and accessory circuits.

Body And Chassis:

Repair procedures for exterior panels, doors, interior trim, glass, and chassis components.

Fuel And Exhaust Systems:

Service for fuel injectors, fuel pump, fuel tank, exhaust manifolds, catalytic converters, and mufflers.

Cooling System:

Maintenance and repair of the radiator, water pump, thermostat, coolant hoses, and fan assembly.

Diagnostic Troubleshooting:

Includes common diagnostic trouble codes (DTCs) and step-by-step troubleshooting guides for various systems.

Wiring Schematics:

Detailed electrical wiring diagrams for all vehicle systems, crucial for electrical diagnostics and repair.

Routine Maintenance:

Oil changes, filter replacements, fluid checks and top-offs, tire rotations, and general inspections.

Major Repairs:

Engine rebuilds, transmission overhauls, complete brake system overhauls, and suspension component replacement.

Component Replacement:

Step-by-step instructions for replacing common wear items and major components.

Diagnostic Procedures:

Systematic approaches to identifying and resolving faults using diagnostic tools and symptom analysis.

Torque Specifications:

Precise torque values for all fasteners, essential for proper assembly and to prevent damage.

Special Tool Requirements:

Identification and usage instructions for specialized tools required for certain repairs.

Depth Of Coverage:

Comprehensive, covering everything from basic maintenance to complete system overhauls and rebuilds, suitable for professional technicians and advanced DIYers.

Illustrations And Diagrams:

Includes detailed exploded views, schematics, and step-by-step illustrations to clarify procedures.

📊 Manual Specifications

File Format:

PDF

Searchability:

Searchable text content via keywords.

Accessibility:

No software installation required, accessible directly via PDF reader.

Print Quality:

High-resolution, designed for clear printing of text and diagrams.

Binding Type:

N/A (Digital PDF)

Paper Type:

N/A (Digital PDF)

⚙️ Engine Specifications

Engine Type:

Duramax 6.6L V8 Turbo Diesel (LLY)

Displacement:

400 cu in (6.6 Liters)

Bore X Stroke:

4.02 in x 3.89 in (102 mm x 99 mm)

Compression Ratio:

18.0:1

Horsepower:

300 hp @ 3100 rpm (estimated for LLY)

Torque:

520 lb-ft @ 1600 rpm (estimated for LLY)

Fuel Type:

Diesel

Injection System:

Direct Injection, Common Rail

Turbocharger:

Variable Geometry Turbocharger (VGT)

Engine Oil Type:

API CJ-4 (or equivalent) SAE 15W-40 or 5W-40 (depending on climate)

Coolant Type:

Dex-Cool (GM P/N 89045663 or equivalent)

Oil Capacity:

10 quarts (9.5 Liters) with filter change

🔧 Transmission

Transmission Type:

Allison 1000 5-Speed Automatic

Transmission Features:

Torque converter lock-up, electronic controls, integrated tow/haul mode.

Transmission Fluid Type:

Dexron III (or equivalent)

Transmission Fluid Capacity:

Approximately 10-12 quarts (9.5-11.4 Liters) for refill, varies with torque converter.

📐 Dimensions

Overall Length:

Approximately 186.5 inches (4737 mm)

Overall Width:

Approximately 86.5 inches (2197 mm)

Overall Height:

Approximately 77.4 inches (1966 mm)

Wheelbase:

Approximately 130 inches (3302 mm)

Curb Weight:

Approximately 7,000-7,500 lbs (3175-3402 kg)

Gross Vehicle Weight Rating Gvwr:

Approximately 10,300 lbs (4672 kg)

Payload Capacity:

Approximately 2,800 lbs (1270 kg)

🛡️ Safety Features

NHTSA Safety Ratings:

Not typically rated by NHTSA due to its specialized nature and military origins.

ABS:

Yes, Anti-lock Braking System

Traction Control:

Yes, often integrated with ABS for enhanced off-road capability.

Airbags:

Driver and passenger airbags standard.

Seatbelts:

Three-point seat belts for front occupants, typically lap belts for rear.

💡 Technology Features

Infotainment System Type:

Basic, typically including an AM/FM stereo with CD player and optional premium sound system. Limited by the era of production.

Driver Assistance Features:

Limited to ABS and traction control. No advanced driver-assistance systems (ADAS) like adaptive cruise control or lane departure warning.

Connectivity Options:

N/A (no factory Bluetooth or USB ports).

🔧 Maintenance

Engine Oil And Filter Change:

Every 5,000-7,500 miles (8,000-12,000 km) or 6-12 months, whichever comes first, depending on usage. Consult manual for severe duty recommendations.

Transmission Fluid And Filter Change:

Every 50,000-75,000 miles (80,000-120,000 km) or annually. More frequently under heavy use.

Coolant Flush And Replacement:

Every 50,000 miles (80,000 km) or 5 years.

Fuel Filter Replacement:

Every 15,000-30,000 miles (24,000-48,000 km), or as per manual recommendation.

Air Filter Replacement:

Inspect every oil change, replace every 20,000-30,000 miles (32,000-48,000 km) or when dirty.

Common H1 Issues:

Potential for CV joint wear, starter motor issues, exhaust manifold cracking (especially on earlier models), and vacuum line degradation. Some electrical gremlins can occur due to age and environment.

Duramax Maintenance Notes:

The Duramax engine is robust but requires diligent adherence to maintenance schedules, especially for the fuel system and turbocharger.

📚 Vehicle History

Brand Origin:

HUMMER originated from AM General's development of the High Mobility Multipurpose Wheeled Vehicle (HMMWV) for the U.S. military.

Civilian Introduction:

The civilian H1 was introduced in 1992.

Key Milestones:

The 2004 model year marked the introduction of the 'Alpha' platform, featuring the powerful Duramax diesel engine and Allison transmission.

Production Period:

1992-2006 for civilian H1.

Manufacturing Location:

Mishawaka, Indiana, USA

🏆 Awards & Recognition

Military Designation:

Direct descendant of the highly successful HMMWV, proven in military operations worldwide.

Off-Road Capability:

Renowned for its extreme off-road capabilities, often exceeding those of contemporary SUVs.