🏷️ Basic Information

Make:

Hummer

Model:

H3

Year:

2008

Generation Code:

First Generation (GMT355 Platform)

Platform Code:

GMT355

👋 Introduction

Positioning:

The Hummer H3 2008 Service Repair Workshop Manual is positioned as a definitive guide for maintaining and repairing the distinctive off-road SUV, targeting owners and independent repair facilities seeking comprehensive factory-level information.

Value Proposition:

Offers factory-level data, detailed illustrations, and lifetime access, providing superior value compared to generic repair guides or subscription-based services.

Features:

Instant download, lifetime access, full factory coverage, detailed photos and diagrams, step-by-step instructions.

📋 Manual Details

Coverage Scope:

All repairs, servicing, and troubleshooting procedures

Estimated Page Count:

Hundreds of pages (exact count not specified, but implied to be comprehensive)

Type:

Factory Service Repair Workshop Manual

Language:

English

Digital Format:

PDF Download

📖 Manual Coverage

Powertrain:

Engine mechanical, fuel system, cooling system, exhaust system, transmission (automatic and manual), transfer case, driveline

Chassis:

Suspension (front and rear), steering system, braking system, wheels and tires

Electrical:

Battery, charging system, starting system, ignition system, lighting system, instrumentation, body control modules, comfort and convenience features, infotainment system, power accessories

Body:

Body structure, exterior panels, interior trim, doors, windows, seats, safety restraints

HVAC:

Heating, Ventilation, and Air Conditioning system

Maintenance:

Scheduled maintenance, fluid changes, filter replacements, inspections

Repair:

Component removal, installation, adjustment, and replacement

Troubleshooting:

Diagnostic procedures, fault code interpretation, symptom-based diagnosis

Diagnostics:

Electrical diagnostics, mechanical diagnostics, using diagnostic scan tools

Disassembly Assembly:

Detailed step-by-step instructions with exploded diagrams for all major components

Depth:

Comprehensive, covering basic to advanced repairs and diagnostics, suitable for professional mechanics and advanced DIYers

📊 Manual Specifications

File Type:

PDF

Printability:

Printable (single pages or entire manual)

Binding:

Digital download (no physical binding)

Paper Quality:

N/A (Digital Format)

Operating Systems:

Windows and MAC compatible

Usage License:

Unlimited usage on multiple devices, no expiry, no renewal fees

⚙️ Engine Specifications

Engine Type 1:

3.7L Inline-5 Cylinder (Vortec LLR)

Displacement 1:

3.7 liters (3700 cc)

Horsepower 1:

Approx. 239 hp @ 5800 rpm

Torque 1:

Approx. 241 lb-ft @ 3600 rpm

Engine Type 2:

5.3L V8 (Vortec LH6 - Optional on Adventure/Luxury trims)

Displacement 2:

5.3 liters (5328 cc)

Horsepower 2:

Approx. 300 hp @ 5200 rpm

Torque 2:

Approx. 320 lb-ft @ 4000 rpm

Fuel Delivery:

Sequential Electronic Fuel Injection (SFI)

Fuel Type:

Unleaded gasoline

Required Octane:

87 octane minimum (91 recommended for optimal performance)

Valve Train:

Overhead Valves (OHV), 2 valves per cylinder (Inline-5), 2 valves per cylinder (V8)

Bore Stroke 1:

3.7L: 95.5 mm x 97.5 mm

Bore Stroke 2:

5.3L: 96.0 mm x 92.0 mm

🔧 Transmission

Transmission Type Standard:

5-Speed Manual Transmission (AZ5-350) - Standard on some trims

Transmission Type Optional:

4-Speed Automatic Transmission (4L60-E) - Standard on most trims and optional with V8

Transfer Case:

Standard 2-speed electronically controlled full-time 4WD with low range gear

Manual Transmission Fluid Spec:

Dexron VI Automatic Transmission Fluid (ATF) or equivalent for manual gearbox

Automatic Transmission Fluid Spec:

Dexron VI Automatic Transmission Fluid (ATF)

📐 Dimensions

Length:

Approx. 183.9 inches (4671 mm)

Width:

Approx. 80.0 inches (2032 mm) (excluding mirrors)

Height:

Approx. 77.4 inches (1966 mm)

Wheelbase:

Approx. 113.0 inches (2870 mm)

Ground Clearance:

Approx. 9.9 inches (251 mm)

Cargo Volume Behind Rear Seat:

Approx. 23.0 cubic feet (0.65 m³)

Cargo Volume With Rear Seat Folded:

Approx. 62.1 cubic feet (1.76 m³)

Curb Weight Approx Min:

Approx. 4,635 lbs (2102 kg)

Curb Weight Approx Max:

Approx. 5,051 lbs (2291 kg) (with V8 and full options)

Gross Vehicle Weight Rating Gvwr:

Approx. 6,400 lbs (2903 kg) to 6,500 lbs (2948 kg)

Towing Capacity:

Approx. 5,000 lbs (2268 kg) (with factory-installed trailer package and V8)

🛡️ Safety Features

NHTSA Rollover Resistance Rating:

4 out of 5 stars (This rating is typical for vehicles of this type, specific year/trim may vary)

IIHS Crash Test Ratings:

Good in front and side crash tests (specific ratings vary by test and year, manual will provide detailed data)

Active Safety Features:

Anti-lock Braking System (ABS), Traction Control System (TCS), StabiliTrak (Electronic Stability Control - may vary by trim)

Passive Safety Features:

Front airbags, front side-impact airbags, LATCH child seat anchors, rollover sensing system

💡 Technology Features

Infotainment System:

Optional AM/FM stereo with CD player, MP3 capability, and available SiriusXM satellite radio. Bose premium audio system available.

Driver Assistance Features:

Rear parking assist system (optional), cruise control.

Connectivity Options:

Auxiliary audio input jack.

Convenience Features:

Power windows, power door locks, remote keyless entry, heated power mirrors, available sunroof.

Headlight Type:

Halogen headlights, automatic headlamp control available.

🔧 Maintenance

Oil Change Interval:

Every 7,500 miles (12,000 km) or 6 months, whichever comes first (severe use may require more frequent changes)

Tire Rotation Interval:

Every 7,500 miles (12,000 km)

Engine Air Filter Replacement:

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

Cabin Air Filter Replacement:

Inspect every 15,000 miles (24,000 km), replace as needed

Engine Oil Type:

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

Engine Oil Capacity:

3.7L: Approx. 5.5 quarts (5.2 L) with filter; 5.3L V8: Approx. 6.0 quarts (5.7 L) with filter

Coolant Type:

Dex-Cool (Orange) Extended Life Antifreeze/Coolant (50/50 mix with distilled water)

Brake Fluid Type:

DOT 3 Brake Fluid

Power Steering Fluid Type:

Dexron III/VI ATF

Common Issues:

Front suspension components (ball joints, tie rods), potential for interior rattles, catalytic converter issues, HVAC blend door actuator failures, minor electrical glitches.

Preventative Maintenance Focus:

Regular inspection of suspension and steering components, especially if used for off-roading. Checking for exhaust leaks.

📚 Vehicle History

Brand Positioning:

Hummer, originally a civilian version of military vehicles, was known for its ruggedness, off-road capability, and distinctive styling.

H3 Introduction:

The H3 was introduced in 2005 as a smaller, more affordable, and fuel-efficient alternative to the H1 and H2, sharing the GMT355 platform with the Chevrolet Colorado and GMC Canyon.

H3 2008 Updates:

The 2008 model year saw the introduction of the more powerful 5.3L V8 engine option, enhancing performance for those seeking greater capability.

Production Location:

Shreveport, Louisiana, USA

Production Years:

2005-2010