🏷️ Basic Information

Make:

Hummer

Model:

H3

Year:

2008

Vehicle Type:

SUV

Body Style:

5-door SUV

👋 Introduction

Target Audience:

Owner-DIY mechanics, independent repair shops, and Hummer H3 enthusiasts seeking factory-level repair information.

Value Proposition:

Offers the same vehicle-specific, factory-authorized repair data used by dealership technicians, providing unparalleled accuracy and completeness compared to generic repair guides.

Feature 1:

Vehicle-specific, not generic.

Feature 2:

Step-by-step instructions, diagrams, illustrations, and wiring schematics.

Feature 3:

Comprehensive coverage from routine maintenance to major repairs.

Feature 4:

Digital format offers portability and easy printing of required pages.

Feature 5:

Compatibility with major operating systems.

📋 Manual Details

General Coverage:

All Models & All Repairs A-Z

Specific Systems:

Engine, Control System, Mechanical, Fuel Service, Emission Control, Intake/Exhaust/Cooling, Lube, Ignition/Starting/Charging, Automatic Transmission, Manual Transmission, Transfer Case, Drive Shaft, Differential, Axle/Suspension, Tire & Wheel, Brake Control, Brakes, Parking Brake, Steering Column, Power Steering, Air Conditioning, Supplemental Restraint System (SRS), Seat Belts, Engine Immobilizer, Cruise Control, Wiper & Washer, Door Locks, Meter/Audio/Visual, Horn, Windshield/Glass/Mirrors, Instrument Panel, Seats, Engine Hood/Doors, Exterior & Interior, Electrical Systems, Multiplex/CAN Communication

Estimated Pages:

Varies significantly by specific engine and drivetrain, typically exceeding 1500 pages for a comprehensive factory manual set.

Type:

Service and Repair Manual

Language:

English

Format:

PDF

📖 Manual Coverage

Engine Mechanical:

Detailed procedures for engine disassembly, assembly, inspection, and repair for all applicable engine variants.

Engine Electrical:

Comprehensive wiring schematics, diagnostic procedures for ignition, starting, charging, and engine control systems.

Powertrain:

In-depth coverage of automatic and manual transmissions, transfer case, drive shafts, differentials, and axles, including rebuild procedures.

Chassis:

Complete information on suspension, steering, brakes, and wheel/tire systems, including diagnosis and repair.

HVAC:

Detailed diagnosis and repair procedures for the air conditioning and heating systems.

Body Electrical:

Coverage of lighting, power windows, door locks, interior and exterior trim, and instrument panel components.

Safety Systems:

Procedures for Supplemental Restraint System (SRS), seat belts, and engine immobilizer systems.

Diagnostics:

Vehicle-specific diagnostic trouble codes (DTCs), symptom-based troubleshooting, and component testing.

Maintenance:

Detailed maintenance schedules, fluid specifications, filter replacements, and preventative service procedures.

Repair:

Step-by-step repair instructions for all major mechanical and electrical components, including rebuilds.

Specifications:

Torque specifications, clearances, fluid capacities, electrical component resistance values, and alignment data.

Schematics:

Complete and detailed wiring diagrams for all vehicle systems.

Depth:

Factory-level technical depth, suitable for dealership technicians and experienced DIY enthusiasts. Includes advanced diagnostics and component-level repair.

📊 Manual Specifications

Format:

PDF

Searchability:

Likely text-searchable within the PDF for quick information retrieval.

Printability:

All pages are printable, allowing users to print specific sections or the entire manual.

Zoom Capability:

Images and diagrams can be blown up for closer inspection and printing.

Binding:

Digital (PDF), no physical binding.

Paper Type:

N/A (Digital format)

Software:

Adobe PDF Reader and Winzip (or similar unzipping utility) required, both free online.

Operating Systems:

Windows Vista (32/64-bit), XP, ME, 98, NT, 2000, and Mac compatible.

⚙️ Engine Specifications

Engine Code:

LM7 (5.3L Vortec V8)

Engine Type:

V8, Naturally Aspirated

Displacement:

5.3 Liters (323 cubic inches)

Bore X Stroke:

3.78 in x 3.62 in (96 mm x 92 mm)

Compression Ratio:

9.5:1

Horsepower @ Rpm:

300 hp @ 5200 RPM (approximate)

Torque @ Rpm:

320 lb-ft @ 4000 RPM (approximate)

Fuel System:

Multi-port Fuel Injection (MPFI)

Fuel Type:

Unleaded Gasoline

Engine Block Material:

Cast Iron

Cylinder Head Material:

Aluminum

Valvetrain:

Overhead Valve (OHV), 2 valves per cylinder

Oil Capacity:

6 Quarts (5.7 Liters) with filter change

Engine Code:

LLR (3.7L Vortec I5)

Engine Type:

Inline-5 Cylinder, Naturally Aspirated

Displacement:

3.7 Liters (226 cubic inches)

Horsepower @ Rpm:

242 hp @ 5600 RPM (approximate)

Torque @ Rpm:

242 lb-ft @ 3600 RPM (approximate)

Valvetrain:

Dual Overhead Camshaft (DOHC), 4 valves per cylinder

🔧 Transmission

Transmission Type:

5-speed Manual (for 3.7L I5)

Transmission Type:

4-speed Automatic (4L60-E, standard on 5.3L V8, optional on 3.7L I5)

Transfer Case:

Standard: Full-time 4WD with electronic locking rear differential. Optional: StabiliTrak with traction control, and optional eLocker rear differential.

Automatic Transmission Fluid:

GM P/N 19256051 (Dexron VI) or equivalent.

Manual Transmission Fluid:

API GL-4 or GL-5, SAE 75W-90 synthetic gear lubricant.

Transfer Case Fluid:

GM P/N 12378412 (Dexron III) or equivalent.

📐 Dimensions

Wheelbase:

119.1 inches (3025 mm)

Length:

184.9 inches (4696 mm)

Width:

81.2 inches (2063 mm) (excluding mirrors)

Height:

75.0 inches (1905 mm)

Ground Clearance:

9.9 inches (251 mm)

Front Headroom:

40.4 inches (1026 mm)

Front Legroom:

42.4 inches (1077 mm)

Rear Headroom:

39.9 inches (1013 mm)

Rear Legroom:

34.1 inches (866 mm)

Cargo Volume Behind Rear Seat:

30.0 cubic feet (850 L)

Cargo Volume With Rear Seat Folded:

62.7 cubic feet (1775 L)

Curb Weight:

Approx. 4,700 - 5,000 lbs (2132 - 2268 kg), depending on engine and configuration.

Gross Vehicle Weight Rating (Gvwr):

Approx. 6,000 - 6,600 lbs (2722 - 2994 kg)

Towing Capacity:

Up to 5,000 lbs (2268 kg)

Standard Wheel Size:

16-inch or 17-inch aluminum alloy (varies by trim/option)

Standard Tire Size:

LT265/75R16 or P265/70R17

Bolt Pattern:

6 x 139.7 mm (6 x 5.5 inches)

🛡️ Safety Features

NHTSA Front Crash Test:

Five Stars (Driver and Passenger)

NHTSA Side Impact Crash Test:

Five Stars (Front and Rear Passengers)

IIHS Moderate Overlap Front:

Good

IIHS Side Impact:

Good

Traction Control:

Standard StabiliTrak with traction control system.

Electronic Stability Control:

Standard StabiliTrak.

Antilock Brakes:

Standard 4-wheel ABS.

Brake Assist:

Included with ABS system.

Airbags Front:

Driver and front passenger airbags.

Airbags Side:

Standard front and rear side curtain airbags.

Seat Belts:

3-point seat belts with pretensioners for all seating positions.

💡 Technology Features

Audio System:

Standard AM/FM stereo with CD player. Optional premium audio systems, XM Satellite Radio, and navigation systems available.

Display:

Optional color touchscreen display for navigation and audio.

Cruise Control:

Standard cruise control.

Parking Assist:

Optional rear parking assist sensors.

Bluetooth:

Optional Bluetooth connectivity for hands-free calling.

Auxiliary Input:

Standard auxiliary audio input jack.

🔧 Maintenance

Oil And Filter Change:

Every 7,500 miles (12,000 km) or 6 months, whichever comes first. Consult manual for severe driving conditions.

Tire Rotation:

Every 7,500 miles (12,000 km).

Air Filter Replacement:

Inspect every 15,000 miles (24,000 km), replace as needed or typically around 30,000 miles (48,000 km).

Spark Plug Replacement:

Approximately 100,000 miles (160,000 km) for iridium-tipped spark plugs.

Coolant Flush:

Initial flush at 100,000 miles (160,000 km), then every 50,000 miles (80,000 km) or 5 years.

Engine Oil Type:

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

Coolant Type:

GM P/N 10-203 L-8711 (Dex-Cool) or equivalent, a long-life, orange coolant.

Brake Fluid Type:

DOT 3 or DOT 4.

Power Steering Fluid:

GM P/N 89021183 (Dexron VI) or equivalent.

Issue 1:

Potential for cracked exhaust manifolds (especially on 3.7L I5 due to heat cycling).

Issue 2:

Water pump leaks can occur over time.

Issue 3:

Rear main seal leaks are not uncommon on the 5.3L V8.

Issue 4:

Check for ABS sensor failures or ABS warning lights.

Issue 5:

Transmission cooler lines can corrode and leak, especially in rust-belt areas.

📚 Vehicle History

Brand Origin:

Hummer originated from AM General, a defense contractor, with its roots in the HMMWV (Humvee).

Parent Company:

General Motors (GM) owned Hummer from 1999 until its discontinuation.

Introduction Year:

The Hummer H3 was introduced for the 2006 model year.

Platform:

Based on the GM Theta platform, shared with the Chevrolet Colorado and GMC Canyon pickup trucks.

Production Start Year:

2005 (for 2006 model year)

Production End Year:

2010

Manufacturing Plant:

Shreveport, Louisiana, USA

🏆 Awards & Recognition

Award 1:

Named one of the 'Top 10 Most American Cars' by AOL Autos due to significant North American content.

Award 2:

Received favorable reviews for its off-road capability and distinctive styling.