Vehicle Class:
Heavy-duty, off-road, multi-purpose vehicle
Target Audience:
Military, law enforcement, civilian off-road enthusiasts, collectors
Competitors Niche:
Unique in its class; direct competitors are limited, often other military surplus vehicles or highly specialized off-roaders.
Vehicle Identity:
Robust construction, exceptional off-road capability, commanding presence
Manual Value Proposition:
Empowers owners and technicians with dealership-level diagnostic and repair information, reducing reliance on specialized workshops.
Primary Coverage:
All mechanical and electrical systems for 1999-2000 HUMMER H1
Secondary Coverage:
Bodywork, chassis, HVAC, diagnostics
Estimated Page Count:
Likely over 1500 pages (typical for comprehensive factory service manuals)
Type:
Workshop Service and Repair Manual
Powertrain:
Engine, transmission, driveline, exhaust
Chassis:
Suspension, steering, brakes, wheels, tires
Electrical:
Wiring diagrams, lighting, starting/charging, instrumentation, body electrical
Comfort And Convenience:
HVAC, interior trim, seats, audio system
Safety Systems:
Airbags (if equipped), seatbelts
Body:
Exterior panels, doors, glass, bumpers
Maintenance Procedures:
Fluid changes, filter replacements, lubrication, inspections
Repair Procedures:
Component removal, installation, adjustment, overhaul, rebuilding
Diagnostic Procedures:
Troubleshooting charts, diagnostic trouble codes (DTCs), electrical diagnostics
Technical Specifications:
Torque values, clearances, tolerances, fluid capacities
Depth:
Comprehensive; covers everything from basic scheduled maintenance to complete engine and transmission rebuilds.
Detail Level:
Detailed step-by-step instructions with diagnostic flowcharts and schematics.
File Type:
Single PDF file
Searchability:
Fully searchable by keywords
Software Requirements:
No installation required, viewable with standard PDF reader
Printability:
Printable (individual pages or sections)
Illustration Quality:
Includes detailed illustrations and diagrams
Binding:
N/A (Digital PDF)
Paper Type:
N/A (Digital PDF)
Dom Engine:
6.5L (395 ci) Turbocharged Diesel (L65)
Dom Engine Configuration:
V8 OHV
Dom Engine Horsepower:
Approx. 195-205 hp @ 3400 rpm
Dom Engine Torque:
Approx. 430-440 lb-ft @ 1600-2000 rpm
Gasoline Engine 5.7L:
5.7L (350 ci) Vortec V8 (L31)
Gasoline Engine 5.7L Horsepower:
Approx. 250 hp @ 4600 rpm
Gasoline Engine 5.7L Torque:
Approx. 330 lb-ft @ 2800 rpm
Gasoline Engine 7.4L:
7.4L (454 ci) Vortec V8 (L29)
Gasoline Engine 7.4L Horsepower:
Approx. 330 hp @ 4000 rpm
Gasoline Engine 7.4L Torque:
Approx. 435 lb-ft @ 3200 rpm
Diesel Fuel Type:
Diesel Fuel
Gasoline Fuel Type:
Unleaded Gasoline
Injection System Diesel:
Direct Injection with Electronic Control
Cooling System Type:
Liquid-cooled
Transmission Type Diesel:
4-speed automatic (THM700R4 / 4L80E)
Transmission Type Gasoline:
4-speed automatic (THM700R4 / 4L80E)
Manual Transmission:
Rare/Non-standard for this era of H1 production
Drivetrain:
Full-time 4-Wheel Drive with Central Tire Inflation System (CTIS)
Transfer Case:
2-speed transfer case with locking center differential
Automatic Transmission Fluid:
Dexron III (or equivalent)
Overall Width:
Approx. 86.5 inches (2197 mm)
Overall Height:
Approx. 79.3 inches (2014 mm)
Overall Length:
Approx. 184.5 inches (4686 mm) - Varies by body style
Ground Clearance:
Approx. 16 inches (406 mm)
Curb Weight:
Approx. 7,000 - 7,500 lbs (3175 - 3402 kg) - Varies by configuration
Gross Vehicle Weight Rating Gvw:
Approx. 9,200 lbs (4173 kg)
Payload Capacity:
Approx. 1,800 - 2,200 lbs (816 - 998 kg)
Crash Test Ratings:
Not typically subjected to standard NHTSA/IIHS crash testing due to its specialized nature and military origins.
Braking System:
Four-wheel disc brakes with ABS (Anti-lock Braking System)
Traction Control:
Standard on some models/configurations; robust mechanical traction aids via differentials.
Airbags:
Driver and front passenger airbags available on civilian models from this era.
Seat Belts:
Three-point front seat belts, lap belts for rear occupants (depending on configuration).
Oil Change Interval:
Diesel: 3,000-5,000 miles (5,000-8,000 km) or 6 months; Gasoline: 3,000 miles (5,000 km) or 6 months.
Transmission Fluid Change Interval:
Every 30,000-50,000 miles (48,000-80,000 km)
Coolant Change Interval:
Every 30,000 miles (48,000 km) or 2 years
Engine Oil Diesel:
API CI-4 or CH-4 15W-40 (or 5W-40 synthetic)
Engine Oil Gasoline:
API SL/SJ 5W-30 or 10W-30
Engine Coolant:
GM P/N 12346130 or equivalent (Green or Orange/Pink OAT)
Common Wear Items:
CV joints, brake components, suspension bushings, alternator, glow plugs (diesel).
Diesel Specific Concerns:
Duramax (later models) had injection pump issues, but 6.5L Turbo is generally robust; intake manifold issues, oil leaks.
Gasoline Specific Concerns:
Older Vortec engines can have intake manifold gasket leaks, distributor issues.
Manufacturer:
AM General, a subsidiary of American Motors Corporation (AMC) initially, later acquired by General Motors.
Origins:
Developed from the High Mobility Multipurpose Wheeled Vehicle (HMMWV or Humvee) military vehicle.
Civilian Introduction:
Civilian version (H1) introduced in 1992.
Production Years H1:
1992-2006
Manufacturing Location:
Mishawaka, Indiana, USA
