🏷️ Basic Information

Make:

Hummer

Model:

H3

Product Name:

Hummer H3 Service Manual Factory Service Workshop Repair Manual

Vin Decoder Context:

Assumes standard GM VIN structure for the H3 era.

👋 Introduction

Brand Identity:

The Hummer H3 was positioned as a rugged, off-road capable SUV with a distinctive, imposing presence, appealing to a niche market seeking an adventurous and visually striking vehicle.

Competitors:

Competed against other large SUVs and off-road vehicles such as the Jeep Wrangler Unlimited, Toyota 4Runner, Ford Explorer Sport Trac (in its pickup variant), and some models from Land Rover.

Unique Selling Points:

Exceptional off-road capability, iconic Hummer styling, robust construction, and a commanding presence on the road.

Target Audience:

Ideal for DIY enthusiasts, independent repair shops, and Hummer H3 owners who want to perform their own maintenance and repairs with factory-level accuracy.

📋 Manual Details

Coverage Summary:

Comprehensive service and repair for all imaginable aspects of the Hummer H3, from routine maintenance to complete component overhauls.

Estimated Page Count:

Estimated 2000+ pages (typical for a complete factory service manual covering multiple model years and engine options).

Manual Type:

Factory Service Manual / Workshop Repair Manual

Language:

English

Format:

PDF with Index

📖 Manual Coverage

Engine Mechanical:

Detailed coverage of engine assembly, disassembly, inspection, and repair for all H3 engine variants (including torque specifications, component clearances, and overhaul procedures).

Engine Electrical:

Complete electrical diagnostics, wiring diagrams, component testing, and troubleshooting for engine control systems, sensors, actuators, and ignition/starting circuits.

Emission Control:

Detailed information on emission control systems, including catalytic converters, oxygen sensors, EVAP systems, and diagnostic procedures for emissions-related faults.

Fuel System:

Comprehensive coverage of fuel delivery, injection systems, fuel pumps, injectors, pressure regulators, and troubleshooting for fuel-related issues.

Clutch System:

Service and repair procedures for manual transmission clutch components, including clutch disc, pressure plate, release bearing, and hydraulic actuation system.

Manual Transaxle:

Detailed overhaul and repair procedures for manual transmissions, including gear sets, synchronizers, shift forks, and lubrication requirements.

Automatic Transaxle:

In-depth coverage of automatic transmission operation, diagnosis, repair, and rebuilding procedures, including valve body, torque converter, and electronic controls.

Driveshaft And Axle:

Service and repair for driveshafts, U-joints, CV joints, axle shafts, and differential components, including lubrication and alignment procedures.

Suspension System:

Comprehensive repair and alignment procedures for independent front suspension, rear multi-link suspension, shock absorbers, springs, and bushings.

Steering System:

Service and repair for power steering systems, steering gear, steering columns, tie rods, and steering angle sensors.

Restraint System:

Detailed information on airbags, seat belts, SRS (Supplemental Restraint System) components, and diagnostic procedures for restraint system faults.

Brake System:

Coverage of hydraulic braking systems, ABS (Anti-lock Braking System), traction control, brake fluid specifications, caliper/rotor service, and bleeding procedures.

Body Interior Exterior:

Procedures for body panel repair, door mechanisms, interior trim, glass replacement, bumpers, and cosmetic component service.

Body Electrical:

Wiring diagrams and troubleshooting for body control modules, lighting systems, power windows/locks, mirrors, and interior electronics.

HVAC System:

Service and repair for heating, ventilation, and air conditioning systems, including refrigerant handling, compressor service, and climate control module diagnostics.

Maintenance Procedures:

Oil changes, filter replacements, fluid flushes (coolant, brake, transmission, power steering), spark plug replacement, belt replacement, tire rotation, and battery checks.

Diagnostic Procedures:

Systematic troubleshooting guides, symptom-based diagnostics, use of diagnostic scan tools, wiring diagram interpretation, and component testing.

Repair Procedures:

Step-by-step instructions for component removal, installation, adjustment, and overhaul, including critical torque specifications and assembly sequences.

Rebuild Procedures:

Detailed guidance for rebuilding major components such as engines, transmissions, and differentials, including required tools and specifications.

Depth Of Coverage:

Expert level, covering complete vehicle overhauls, engine and transmission rebuilds, complex electrical diagnostics, and specialized system repairs.

📊 Manual Specifications

File Type:

PDF

Searchability:

Searchable text within the PDF for quick information retrieval.

Indexing:

Includes an index for navigation and quick access to specific sections.

Image Resolution:

High-resolution images, diagrams, and schematics for clarity.

Binding:

Digital (PDF) - not applicable for physical binding.

Paper Quality:

Digital (PDF) - not applicable for paper type.

⚙️ Engine Specifications

Engine Type 1:

3.7L Vortec I5 (L52)

Displacement 1:

3.7 Liters (226 cubic inches)

Horsepower 1:

242 hp @ 5600 rpm (approx.)

Torque 1:

242 lb-ft @ 4600 rpm (approx.)

Engine Type 2:

5.3L Vortec V8 (LH6)

Displacement 2:

5.3 Liters (327 cubic inches)

Horsepower 2:

305 hp @ 5200 rpm (approx.)

Torque 2:

336 lb-ft @ 4000 rpm (approx.)

Fuel Type:

Unleaded Gasoline

Fuel Delivery:

Multi-port Fuel Injection (MPI) / Sequential Electronic Fuel Injection (SEFI)

Ignition System:

Distributorless Ignition System (DIS) with Coil-on-Plug (COP)

🔧 Transmission

Manual Transmission:

5-speed Manual (e.g., NV1500 / NV3550)

Automatic Transmission:

4-speed Automatic (4L60-E / 4L70-E)

Drivetrain:

Full-time 4-Wheel Drive (4WD) with locking rear differential and optional front locking differential on certain models/trims.

📐 Dimensions

Length:

Approximately 188.0 - 190.7 inches

Width:

Approximately 84.5 inches (with mirrors)

Height:

Approximately 77.0 - 77.7 inches

Wheelbase:

Approximately 119.0 inches

Ground Clearance:

Approximately 9.9 inches

Curb Weight:

Approximately 4,700 - 5,000 lbs (varies by engine and configuration)

Towing Capacity:

Approximately 5,000 lbs

Max Payload:

Approximately 1,200 - 1,500 lbs

🛡️ Safety Features

NHTSA Rollover Rating:

Typically 4-star (check specific model year for exact ratings).

ABS:

Standard Anti-lock Braking System (ABS)

Traction Control:

Standard Traction Control System (TCS)

Stability Control:

Electronic Stability Control (ESC) available on later models.

Airbags:

Frontal airbags, available side-curtain airbags.

Seat Belts:

3-point seat belts with pretensioners.

💡 Technology Features

Audio System:

Standard AM/FM/CD audio system, optional premium sound systems, and in-dash CD changers on some trims.

Navigation:

Optional factory navigation system available on higher trims.

Parking Assist:

Optional rear parking assist sensors.

Camera Systems:

Rearview camera optional on later models.

Connectivity Features:

Auxiliary audio input jack standard on most models, Bluetooth hands-free calling available on select trims.

🔧 Maintenance

Oil Change Interval:

Typically every 7,500 miles or 6 months (refer to manual for exact recommendation based on driving conditions).

Tire Rotation Interval:

Every 7,500 miles

Coolant Flush Interval:

Every 100,000 miles or 5 years (initial) thereafter every 50,000 miles or 5 years.

Engine Oil Type:

SAE 5W-30 Synthetic Blend or Full Synthetic (API Certified).

Engine Oil Capacity:

Approx. 5.7 quarts (3.7L I5) / 6.0 quarts (5.3L V8) with filter change.

Transmission Fluid Type Auto:

Dexron VI Automatic Transmission Fluid

Transmission Fluid Type Manual:

Manual Transmission Fluid (specific type varies, consult manual, often GL-4 or GL-5)

Brake Fluid Type:

DOT 3 or DOT 4 Hydraulic Brake Fluid

Coolant Type:

GM-spec Orange Long-Life Coolant (50/50 mix with distilled water)

Common Wear Items:

Ball joints, tie rod ends, sway bar links (due to weight and off-road use), potentially rear main seal leaks on higher mileage I5 engines, transfer case actuator issues.

Electrical Quirks:

Occasional issues with window regulators, central locking actuators, and some body control module glitches.

Engine Performance:

Some owners report the 3.7L I5 can feel underpowered for the vehicle's weight, especially when towing or in demanding off-road situations.

📚 Vehicle History

Parent Company:

General Motors (GM)

Introduction Year:

2006

Production End Year:

2010

Model Years Covered:

2006, 2007, 2008, 2009, 2010

Manufacturing Location:

Shreveport, Louisiana, USA

🏆 Awards & Recognition

Off Road Acclaim:

Frequently praised in automotive media for its robust off-road capability and unique styling.

Consumer Reports Rating:

Variable, often citing average to below-average predicted reliability depending on the model year.

Manufacturer Certification:

This manual is factory-issued and the standard reference used by authorized Hummer/GM technicians.