The Hummer H3 3.5i, produced from 2005 to 2008, represented General Motors’ attempt to capture a smaller, more accessible segment of the off-road SUV market. Positioned as the entry-level offering within the H3 range, the 3.5i with its 3.5-liter inline-five engine and four-speed automatic transmission aimed to provide a blend of Hummer’s iconic styling and capability with a more manageable price point and fuel consumption compared to the larger H2. It was built on a modified version of the GM Colorado/Canyon mid-size truck platform, offering a significant departure from the AM General-sourced H1, and a downsized alternative to the H2. This variant was primarily sold in North America, catering to buyers seeking a rugged-looking vehicle with four-wheel drive capability for both on and off-road adventures.
Technical Specifications
| Brand | Hummer |
| Model | H3 |
| Generation | H3 |
| Type | 3.5i 20V (223 Hp) 4×4 Automatic |
| Start of production | 2005 |
| End of production | 2008 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Off-road vehicle, SUV |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (urban) | 14.7 l/100 km (16 US mpg, 19.2 UK mpg, 6.8 km/l) |
| Fuel consumption (extra urban) | 12.4 l/100 km (19 US mpg, 22.8 UK mpg, 8.1 km/l) |
| Fuel consumption (combined) | 13.8 l/100 km (17 US mpg, 20.5 UK mpg, 7.2 km/l) |
| Fuel Type | Petrol (Gasoline) |
| Maximum speed | 158 km/h (98.18 mph) |
| Weight-to-power ratio | 9.6 kg/Hp, 104.6 Hp/tonne |
| Weight-to-torque ratio | 7 kg/Nm, 143.1 Nm/tonne |
| Power | 223 Hp @ 5600 rpm |
| Power per litre | 64.5 Hp/l |
| Torque | 305 Nm @ 2800 rpm (224.96 lb.-ft. @ 2800 rpm) |
| Maximum engine speed | 6300 rpm |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | L52 |
| Engine displacement | 3460 cm3 (211.14 cu. in.) |
| Number of cylinders | 5 |
| Engine configuration | Inline |
| Cylinder Bore | 93 mm (3.66 in.) |
| Piston Stroke | 102 mm (4.02 in.) |
| Compression ratio | 10:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | DOHC |
| Engine oil capacity | 5.7 l (6.02 US qt | 5.02 UK qt) |
| Coolant capacity | 9.5 l (10.04 US qt | 8.36 UK qt) |
| Kerb Weight | 2132 kg (4700.26 lbs.) |
| Max. weight | 2654 kg (5851.07 lbs.) |
| Max load | 522 kg (1150.81 lbs.) |
| Trunk (boot) space – minimum | 835 l (29.49 cu. ft.) |
| Trunk (boot) space – maximum | 1575 l (55.62 cu. ft.) |
| Fuel tank capacity | 87 l (22.98 US gal | 19.14 UK gal) |
| Length | 4742 mm (186.69 in.) |
| Width | 1897 mm (74.69 in.) |
| Height | 1872 mm (73.7 in.) |
| Wheelbase | 2842 mm (111.89 in.) |
| Front track | 1651 mm (65 in.) |
| Rear (Back) track | 1664 mm (65.51 in.) |
| Ride height (ground clearance) | 216 mm (8.5 in.) |
| Drag coefficient (Cd) | 0.55 |
| Minimum turning circle | 11.3 m (37.07 ft.) |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 4 gears, automatic transmission |
| Front suspension | Torsion |
| Rear suspension | Leaf spring |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Tires size | 265/75 R16 |
| Wheel rims size | 16 |
Powertrain & Engine Architecture
The heart of the H3 3.5i is the L52 3.5-liter inline-five cylinder engine. This engine, part of GM’s Atlas family, featured a cast iron block and aluminum cylinder heads. It utilized multi-port fuel injection and a double overhead camshaft (DOHC) valvetrain with four valves per cylinder. The engine produced 223 horsepower at 5600 rpm and 305 Nm (224.96 lb-ft) of torque at 2800 rpm. The four-speed automatic transmission (4L60-E) was the sole transmission option for this variant. While adequate for everyday driving, the 4L60-E was criticized for its relatively conservative gear ratios and tendency to hunt for gears, especially when towing or driving in hilly terrain. The engine’s longitudinal mounting and rear-wheel-drive bias, coupled with the selectable four-wheel-drive system, provided a traditional SUV driving experience.
Driving Characteristics
The H3 3.5i Automatic offered a comfortable, if not particularly exhilarating, driving experience. Acceleration was adequate for merging and highway cruising, but the engine felt strained when pushed hard. The automatic transmission, while smooth in normal driving, lacked the responsiveness of a manual transmission and didn’t fully exploit the engine’s torque. Compared to the more powerful H3 Alpha (with the 5.3L V8), the 3.5i felt noticeably slower. The four-wheel-drive system provided good traction in off-road situations, but the H3’s relatively heavy weight and high center of gravity limited its performance in more challenging terrain. The leaf spring rear suspension, while robust, contributed to a somewhat bumpy ride, especially when unladen.
Equipment & Trim Levels
The H3 3.5i typically came standard with features such as air conditioning, power windows and locks, a CD player, and cloth upholstery. Optional extras included leather seats, a premium sound system, sunroof, and upgraded off-road packages with features like skid plates and a locking rear differential. The interior design was functional and utilitarian, reflecting the H3’s rugged character. Trim levels varied slightly depending on the year, but generally offered increasing levels of comfort and convenience features. The base model was fairly spartan, while higher trims added more luxury appointments.
Chassis & Braking
The H3’s chassis was based on a modified version of the GM Colorado/Canyon mid-size truck platform, featuring a body-on-frame construction. The front suspension utilized torsion bars, while the rear suspension employed leaf springs. This setup provided a good balance of ride comfort and load-carrying capacity. Braking duties were handled by ventilated discs at the front and solid discs at the rear. Anti-lock brakes (ABS) were standard. The H3’s relatively heavy weight and limited suspension travel meant that it wasn’t as agile or refined as some of its competitors.
Market Reception & Comparison
The H3 3.5i was generally well-received by critics as an affordable and capable off-road SUV. However, its fuel economy was a common complaint, averaging around 17 mpg in combined driving. Compared to the H3 Alpha, the 3.5i offered a more economical option, but at the expense of performance. Against competitors like the Jeep Wrangler and Toyota 4Runner, the H3 3.5i offered a unique blend of styling and capability, but often fell short in terms of refinement and fuel efficiency. The automatic transmission was often criticized for its lack of responsiveness and tendency to hunt for gears.
Legacy
The Hummer H3 3.5i, while not a long-lived model due to the demise of the Hummer brand, has developed a following among enthusiasts who appreciate its rugged styling and off-road capability. The 3.5-liter inline-five engine, while not known for its exceptional reliability, is generally considered to be reasonably durable with proper maintenance. Common issues include oil leaks and sensor failures. Today, the H3 3.5i can be found on the used car market at relatively affordable prices, making it an attractive option for buyers seeking a distinctive and capable SUV. However, potential buyers should be aware of the vehicle’s poor fuel economy and the potential for maintenance issues associated with its age and complexity.
