Target Audience:
DIY enthusiasts, independent repair shops, fleet maintenance technicians.
Comparison To Print:
Offers superior convenience, searchability, and up-to-date access compared to older, potentially outdated printed manuals. Licensed OE data ensures accuracy.
Licensing:
Officially licensed and derived from OE (Original Equipment) materials, ensuring accuracy and reliability.
Access Method:
Instant online access via internet connection and web browser across multiple devices.
Subscription Model:
Full year of access included, with discounts for extended access, providing ongoing value.
Software Provider:
RepairSurge, an automotive software company specializing in licensed repair information.
Powertrain:
Engine mechanical, fuel system, ignition system, cooling system, exhaust system, emissions control
Drivetrain:
Manual transmission, automatic transmission, transfer case (if applicable to G1500 variants), driveshafts, axles, differentials
Chassis:
Suspension (front and rear), steering system, braking system (front and rear discs/drums), wheels and tires
Electrical:
12V electrical system, battery, charging system (alternator), starting system (starter motor), lighting, instrumentation, body control modules, wiring diagrams, fuses and relays
HVAC:
Heating, ventilation, and air conditioning systems (components, operation, service)
Body And Interior:
Body panels, doors, windows, seats, interior trim, body hardware
Emissions Control:
Detailed coverage of emission control systems, including EGR, catalytic converter operation, and evaporative emission control (EVAP) systems.
Fuel System Details:
Fuel pump pressure testing, injector diagnostics, fuel filter replacement, fuel tank service.
Steering System Details:
Power steering pump, steering gear/rack and pinion, tie rod ends, steering linkage components.
Brake System Details:
Front disc brake overhaul (pads, rotors, calipers), rear drum brake service (shoes, drums, wheel cylinders), brake fluid bleeding, parking brake adjustment.
Cooling System Details:
Radiator service, water pump replacement, thermostat diagnosis and replacement, coolant hose inspection and replacement.
Maintenance:
Scheduled maintenance intervals, fluid changes (oil, coolant, brake fluid, transmission fluid, differential fluid), filter replacements, lubrication
Diagnostics:
Troubleshooting common issues, diagnostic trouble codes (DTCs) interpretation (OBD-I era), component testing procedures
Repair:
Component removal and installation, component overhaul and rebuilding, adjustments, alignment procedures
Installation:
Installation procedures for specific aftermarket accessories (if covered by OE service information)
Wiring Diagrams:
Extensive electrical system wiring diagrams included, crucial for troubleshooting electrical faults.
Troubleshooting Charts:
Systematic troubleshooting charts and flowcharts to diagnose and resolve common vehicle problems.
Diagnostic Tools:
Guidance on using diagnostic tools relevant to the OBD-I system, including reading and interpreting diagnostic codes.
Depth:
Comprehensive, covering from basic maintenance to major component overhaul and complex diagnostics.
Torque Specifications:
Detailed torque specifications for critical fasteners in engine, transmission, suspension, and brake systems.
Engine Options:
Likely 4.3L (262 cu in) V6 (VIN 'Z' or 'W'), 5.0L (305 cu in) V8 (VIN 'E'), 5.7L (350 cu in) V8 (VIN 'K'). Specific engine availability depends on G1500 configuration (van/truck).
Horsepower Torque Details:
Varies by engine. The 4.3L V6 typically produced around 160-165 hp and 230-235 lb-ft torque. V8 options offered higher output. Precise figures require VIN lookup.
Engine Variations Notes:
The specific engine and transmission options could vary considerably based on the body style (e.g., short wheelbase van vs. long wheelbase cargo van or passenger van) and original intended use. VIN decoding is essential for precise specifications.
Fuel Delivery:
Throttle Body Injection (TBI) for most 1990 models, potentially Multi-Port Fuel Injection (MPFI) on some V8 variants.
Ignition Type:
Electronic Ignition (EST - Electronic Spark Timing), Distributor-based.
Coolant Type:
Ethylene Glycol based antifreeze (typically a 50/50 mix with distilled water). Refer to manual for specific GM specification (e.g., DEX-COOL predecessor).
Recommended Oil Viscosity:
Likely SAE 10W-30 or 5W-30, depending on ambient temperature. Verify with manual for specific engine.
Oil Capacity:
Typically 4.5 - 5 quarts (4.3 - 4.7 liters) with filter for V6, and 5 quarts (4.7 liters) for V8. Consult manual for exact capacity based on engine.
Wheelbase Options:
Variable depending on body style (e.g., van chassis length, truck wheelbase). G1500 van typically offered multiple wheelbase options.
Body Styles:
Panel Van, Passenger Van, potentially Chassis Cab for specialized upfitting.
Gross Vehicle Weight Rating Gvwr:
Varies significantly by configuration. G1500 models are typically in the 3/4 ton classification range, with GVWRs often between 5,500 - 7,200 lbs (2,495 - 3,266 kg).
Curb Weight:
Highly variable based on body style, engine, and equipment. Expect curb weights to range from approximately 3,800 - 4,500 lbs (1,724 - 2,041 kg).
Payload Capacity:
Varies by configuration, but G1500 models are designed for substantial payload. Refer to vehicle's door jamb sticker or manual for exact figures.
Engine Oil Change Interval:
Typically 3,000 - 5,000 miles (4,800 - 8,000 km) or 3-6 months, whichever comes first. Refer to manual for specific recommendation based on driving conditions.
Transmission Fluid Change Interval:
Typically 30,000 - 60,000 miles (48,000 - 96,000 km) for automatic transmissions, or as specified by severe service conditions. Manual transmission fluid changes also specified.
Coolant Flush Interval:
Typically every 24,000 - 30,000 miles (38,000 - 48,000 km) or 2 years, depending on coolant type.
Spark Plug Replacement Interval:
Typically 30,000 miles (48,000 km) for conventional spark plugs, or longer if platinum/iridium plugs were factory-equipped (less common in 1990).
Power Steering Fluid:
GM Power Steering Fluid or Dexron® type fluid. Refer to manual for specific OE specification.
Brake Fluid:
DOT 3 brake fluid (meeting SAE J1703 or FMVSS 116 standards).
Transmission Type Specific Fluid:
For 4L60/4L60-E automatic transmissions, DEXRON®-II E or DEXRON®-III automatic transmission fluid is specified. Manual transmissions use GL-4 gear oil (e.g., 75W-90 or 80W-90).
Common G1500 Issues 1990:
Potential for vacuum line leaks, fuel pump issues, aging electrical components (corrosion on connectors), suspension wear (ball joints, bushings), exhaust manifold leaks on V8 engines, and transmission solenoid issues in automatics.
Oil Filter Example:
AC Delco PF25, Fram PH8A, WIX 51515 (Verify application for specific engine).
Air Filter Example:
AC Delco A218C, Fram CA3028 (Verify application for specific engine).