Operating the vehicle, starting and stopping, driving in various conditions, understanding dashboard indicators
Safety Features:
Operation of airbags, seat belts, child restraint systems, vehicle security system
Technical Depth
Technical Depth:
Covers owner-level maintenance, operation, and basic troubleshooting. Does not include detailed repair procedures or diagnostic codes.
Manual Specifications
File Format
File Format:
PDF
Accessibility:
Requires PDF reader (e.g., Adobe Acrobat Reader, Foxit Reader)
Print Quality
Print Quality:
Digital reproduction of original factory manual, quality dependent on source scan but generally clear for text and diagrams.
Binding Type
Binding Type:
N/A (Digital PDF download)
Paper Type
Paper Type:
N/A (Digital PDF download)
Engine Specifications
Primary Engine
Engine Type:
Vortec 6.0L V8 SFI
Engine Code:
LQ4
Performance
Horsepower:
325 hp @ 5200 rpm
Torque:
370 lb-ft @ 3200 rpm
Fuel System
Fuel Delivery:
Sequential Fuel Injection (SFI)
Fuel Type:
Unleaded gasoline, 87 octane (minimum)
Engine Compartment
Engine Layout:
Front-mounted, longitudinal V8
Cylinder Block Material:
Cast Iron
Cylinder Head Material:
Aluminum
Refill Capacities
Engine Oil Capacity:
7 quarts (with filter change)
Transmission
Standard
Transmission Type:
4-Speed Automatic
Transmission Model:
4L65-E
Features
Transmission Features:
Electronically controlled, with overdrive and Tow/Haul mode
Fluid Specifications
Transmission Fluid Type:
Dexron-III (or equivalent approved synthetic)
Dimensions
Exterior
Length:
207.1 inches
Width:
84.5 inches
Height:
79.1 inches
Wheelbase:
130.0 inches
Weights
Curb Weight:
Approximately 6,900 - 7,300 lbs
Gross Vehicle Weight Rating Gvwr:
9,200 lbs
Towing Capacity:
Up to 10,000 lbs
Cargo
Cargo Volume Behind 2Nd Row:
Approximately 45.7 cubic feet
Cargo Volume Behind 1St Row:
Approximately 99.0 cubic feet
Safety Features
Ratings
NHTSA Front Crash Test Rating:
4 stars (driver and passenger, for 2003 models)
NHTSA Side Crash Test Rating:
5 stars (front and rear passengers, for 2003 models)
Active Features
Active Safety Features:
Four-wheel Anti-lock Braking System (ABS), Traction Control System (TCS), StabiliTrak (optional)
Passive Features
Passive Safety Features:
Driver and front passenger airbags, front seat-mounted side-impact airbags, three-point seat belts with pretensioners and load limiters, LATCH child seat anchors
AM/FM stereo with CD player, available Bose premium audio system, available satellite radio
Navigation System:
Optional factory-installed navigation system available on some trims
Driver Assistance
Driver Assistance Features:
Optional StabiliTrak stability control system
Connectivity
Connectivity Options:
OnStar communication system (subscription-based service) available
Maintenance
Service Intervals
Engine Oil Change Interval:
Every 5,000 to 7,500 miles or 6 months, whichever comes first (refer to manual for specific severe/normal duty) - typically 7500 miles recommended by GM for this era with synthetic oil.
Tire Rotation Interval:
Every 5,000 to 7,500 miles
Transmission Fluid Change Interval:
Approximately 100,000 miles (under normal conditions, check manual for severe use)
Fluid Specifications
Engine Oil Specification:
SAE 5W-30 Synthetic (API SM or higher)
Coolant Type:
Dex-Cool Long Life (50/50 mixture with distilled water)
Brake Fluid Type:
DOT 3
Power Steering Fluid Type:
GM Power Steering Fluid (or equivalent)
Known Issues
Common Wear Items:
Ball joints, tie rod ends, wheel bearings (due to weight and off-road use), fuel pump, interior electronics (especially HVAC controls).
Engine Specifics:
Potential for intake manifold gasket leaks (though less common on later Vortec V8s), oil cooler line leaks.
Part Numbers
Engine Oil Filter Example:
ACDelco PF26 (or equivalent)
Air Filter Example:
ACDelco A1342C (or equivalent)
Vehicle History
Brand Heritage
Parent Company:
General Motors (GM)
Hummer Origins:
Based on AM General's military Humvee (HMMWV)
Model Evolution
Introduction Year:
2003
Platform:
GMT820 platform (shared with Chevrolet Tahoe/Suburban and GMC Yukon/Yukon XL)
Production
Assembly Location:
Mishawaka, Indiana, USA
Production Duration:
2003-2009
Awards & Recognition
Recognitions
Off Road Awards:
Often recognized for its off-road capability and ruggedness by enthusiasts and publications focused on off-road vehicles.
Ratings
Fuel Economy Ratings:
Generally considered poor by modern standards, reflecting its size, weight, and off-road focus (EPA estimated: ~10-11 MPG city, ~13-15 MPG highway for 2003 model).
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