1998 GMC G25/G2500 VAN REPAIR MANUAL -- HOW TO FIX YOUR CAR OR TRUCK

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1998 GMC G25/G2500 VAN CAR/TRUCK REPAIR PROCEDURES AND DIAGRAMS - WHAT GMC REPAIR SHOPS DON'T WANT YOU TO KNOW

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Get Full Access Automotix DIY provides automotive consumers and do it yourselfers; the most comprehensive repair information about 1998 GMC G25/G2500 VAN car and truck repair procedures including GMC engine diagrams, wiring diagrams, repair work estimating measures, technical service bulletins, auto body work guidance, starter & alternator replacement procedures, serpentine belt replacement procedures, radiator & hose replacement procedures, tune-up & drivability specifications, quick lube illustrations, preventive maintenance guide, engine light reset instructions, parts removal and install procedures, fuel filter replacement directions, component location diagrams, air filter locations & replacement instructions, a/c system specifications, and general auto service procedures. You don't have to be a car mechanic or technician to know how to fix your GMC G25/G2500 VAN automobile. Try the Automotix DIY solution today!
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Using the Automotix DIY repair procedures will save you hundreds and even thousands of dollars! In addition, it will save you hours of touring the city searching for GMC mechanics you can trust. The Automotix DIY solution is particularly affordable. A full access to the entire DIY repair procedures and diagrams for your 1998 GMC G25/G2500 VAN vehicle will cost less than a single gallon of gas. Here are some of the DIY repair tips and procedures you will find here:

A/C & HEATER SERVICE PROCEDURES FOR 1998 GMC G25/G2500 VAN AUTOMOBILES

Component Replacement & Adjustment -> Light Duty Trucks & Vans -> Thermostat, Replace -> Astro, Bravada, Safari, S & T Series -> C, G, K & P Series -> Diesel Engine -> Gasoline Engine -> Montana, Silhouette, Trans Sport & Venture -> Tracker
Vehicle: 1998 GMC G25/G2500 VAN 5.0 V8 GAS

C, G, K & P Series
Gasoline Engine
  • Remove engine cover, air cleaner and air inlet duct.
  • Drain cooling system until radiator coolant level is below thermostat.
  • Remove radiator hose at coolant outlet.
  • Remove thermostat housing mounting bolts and ground wire.
  • Remove thermostat housing, thermostat and gasket.
  • Reverse procedure to install, noting the following:
    • On all models except 7.4L engine, torque attaching bolts to 21 ft. lbs.
    • On 7.4L engine, torque attaching bolts to 27 ft. lbs.
Diesel Eng...

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BRAKE SERVICE PROCEDURES FOR 1998 GMC G25/G2500 VAN AUTOMOBILES

Disc Brakes -> Delco Single Piston Sliding Caliper -> Caliper Service -> Assemble -> Blazer, Bravada & Jimmy -> Disassemble -> Front -> Inspection -> Installation -> Rear -> Removal -> Sierra & Silverado
Vehicle: 1998 GMC G25/G2500 VAN 4.3 V6 GAS

Removal

Front
  • Siphon brake fluid out of master cylinder until fluid level is approximately 1/3 full, this will prevent fluid overflow when caliper piston is pushed back into its bore.
  • Raise and support vehicle, then remove wheels.
  • Push piston back into its bore using suitable C-clamp, Fig. .
  • Remove two caliper mounting bolts and lift caliper off of rotor.
Rear
Blazer, Bravada & Jimmy
  • Raise and support vehicle.
  • Mark position of wheel to hub for installation reference.
  • Remove wheel assembly.
  • Remove mounting bolt and disconnect brake hose fitting from caliper. Discard gaskets and plug brake h...

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FUEL FILTER REPLACEMENT PROCEDURES FOR 1998 GMC G25/G2500 VAN AUTOMOBILES

General Motors Corp./Saturn Light Trucks, SUVs & Vans -> Component Locations -> C/K, G & R/V Series w/6.2L, 6.5L & 6.6L Diesel Engines
Vehicle: 1998 GMC G25/G2500 VAN 6.5 V8 DIESEL

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DRIVELINE, U-JOINT & CV AXLES REPLACEMENT PROCEDURES FOR 1998 GMC G25/G2500 VAN AUTOMOBILES

DRIVESHAFT U-JOINT, Replace -> Assemble -> Disassemble
Vehicle: 1998 GMC G25/G2500 VAN 5.7 V8 GAS

Never clamp propeller shaft tubing in a vise. Clamping could dent or deform the tube causing an imbalance or unsafe condition. Always clamp on one of the yokes and support the shaft horizontally. Avoid damaging the slip yoke sealing surface. Nicks may damage the bushing or cut the lip seal.

Disassemble

  • Support propeller shaft in a line horizontal with table of a press.
  • Mark propeller shaft in order to show which end connects to transmission and which end goes to rear axle.
  • On models equipped with external snap ring retainers, proceed as follows:
    • Disassemble snap rings by ...

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STARTER & ALTERNATOR REPLACEMENT PROCEDURES FOR 1998 GMC G25/G2500 VAN AUTOMOBILES

Alternator, Replace -> Auxiliary -> Single Alternator
Vehicle: 1998 GMC G25/G2500 VAN 5.0 V8 GAS

Single Alternator

  • Disconnect battery ground cable.
  • Remove coolant reservoir and air cleaner.
  • Remove upper fan shroud.
  • Remove drive belt, using suitable removal tool.
  • Remove heater hose pipe from alternator and oil fill tubes from support bracket.
  • Remove alternator mounting bolts, then alternator from vehicle.
  • Disconnect electrical connectors.
  • Reverse procedure to install, noting the following:
    • Torque front alternator mounting bolt to 37 f...

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MAINTENANCE LAMP RESET PROCEDURES FOR 1998 GMC G25/G2500 VAN AUTOMOBILES

General Motors Corp./Saturn Trucks -> Traction Control System (TCS)/Electronic Stability Control (ESC) Warning Lamp ->
Vehicle: 1998 GMC G25/G2500 VAN 6.5 V8 DIESEL

This lamp should light for a approximately 6-8 seconds when the ignition is turned On as a bulb check. If t...

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RADIATOR & HOSE REPLACEMENT PROCEDURES FOR 1998 GMC G25/G2500 VAN AUTOMOBILES

Radiator, Replace
Vehicle: 1998 GMC G25/G2500 VAN 5.0 V8 GAS

  • Drain coolant into a suitable container.
  • Remove air cleaner, duct and coolant recovery reservoir.
  • Remove mounting bolts, upper to lower mounting bolts and upper fan shroud.
  • Remove mounting bolts and low...

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SERPENTINE BELT SERVICE PROCEDURES FOR 1998 GMC G25/G2500 VAN AUTOMOBILES

Serpentine Drive Belt, Replace
Vehicle: 1998 GMC G25/G2500 VAN 4.3 V6 GAS

These engines use a single serpentine drive belt to drive all engine-mount accessories. All belt drive accessories are rigidly mounted with belt tension maintained by a spring loaded automatic tensioner.

  • Rotate tensioner counterclockwise using suitable 1/2 inch break...

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COMPONENT LOCATION DIAGRAMS FOR 1998 GMC G25/G2500 VAN AUTOMOBILES

Component location diagrams for most 1998 GMC G25/G2500 VAN cars and light trucks sold in the U.S. from 1990+.

LH Front Corner Of Engine Diagram for 1998 GMC G25/G2500 VAN 4.3 V6 GASLH Front Corner Of Engine Diagram for 1998 GMC G25/G2500 VAN 4.3 V6 GAS

Components on diagram:
  • Power Steering Fluid Flow Actuator
  • P/B Booster Pressure Warning Switch
    • Engine & Transmission Wiring Harness Diagram for 1998 GMC G25/G2500 VAN 6.5 V8 DIESELEngine & Transmission Wiring Harness Diagram for 1998 GMC G25/G2500 VAN 6.5 V8 DIESEL

    Components on diagram:
  • Oxygen Sensor
  • Output Speed Sensor
  • Input Speed Sensor
  • Transmission
  • Connector C-301

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    WIRING DIAGRAMS FOR 1998 GMC G25/G2500 VAN AUTOMOBILES

    OEM drawn wiring diagrams for most 1998 GMC G25/G2500 VAN cars and light trucks sold in the U.S.

    1998 GMC G25/G2500 VAN 5.7 V8 GAS Wiring Diagram1998 GMC G25/G2500 VAN 5.7 V8 GAS Wiring Diagram

    Components on diagram:
  • Blower Motor Switch
  • Blower Motor Resistor
  • Blower Motor
  • Blower Motor Relay
  • Heater and A/C Controller
    • 1998 GMC G25/G2500 VAN 5.0 V8 GAS Wiring Diagram1998 GMC G25/G2500 VAN 5.0 V8 GAS Wiring Diagram

    Components on diagram:
  • Vehicle Control Module
  • A/C Compressor Clutch
  • A/C Compressor Enable Relay
  • A/C Compressor Low Pressure Cutout Switch

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    TECHNICAL SERVICE BULLETINS FOR 1998 GMC G25/G2500 VAN AUTOMOBILES

    OEM TSB listings for most 1998 GMC G25/G2500 VAN cars and light trucks sold in the U.S. from 1985+.

    Document: Revised General Motors New Vehicle Tire Warranty Program
    Vehicle: 1998 GMC G25/G2500 VAN 5.7 V8 GAS

    Auto Systems:
  • Labor Times, Manuals, Warranty, Aids
  • Wheels, Tires, Wheel Bearings, Seals, Hubs
    • Document: New Website for AFIT, TPM, and VDR Updates
    Vehicle: 1998 GMC G25/G2500 VAN 5.7 V8 GAS

    Auto Systems:
  • Labor Times, Manuals, Warranty, Aids

    • CLICK HERE TO GET FULL ACCESS TO 1998 GMC G25/G2500 VAN TECHNICAL SERVICE BULLETINS!

    COMPONENT/PARTS SPECIFICATIONS FOR 1998 GMC G25/G2500 VAN AUTOMOBILES

    BRAKE SPECIFICATIONS: Brake drum, rotor, caliper, and related specifications for most 1998 GMC G25/G2500 VAN cars and light trucks sold in the U.S. and Canada from 1970+.

    • Brake caliper mounting bolt torque
    • Brake drum runout, machining, & discard specs
    • Minimum brake lining thickness.
    • Brake rotor runout, parallelism, machining, discard, & finish specs

    A/C SYSTEM SPECIFICATIONS: Air conditioning refrigerant capacity and type as well as lubricant capacity for most 1998 GMC G25/G2500 VAN cars and light trucks sold in the U.S. and Canada from 1980+.

    • Refrigerant capacity & type, compressor oil viscosity, total system oil capacity & compressor clutch gap

    COOLING SYSTEM BLEED: Cooling system bleeder valve identification, bleeder type and bleed procedures for most domestic and imported cars and light trucks sold in the U.S. and Canada from 1986+.

    PREVENTIVE MAINTENANCE: Preventive maintenance recommendations and required services for most domestic and imported cars and light trucks sold in the U.S. and Canada from 1980+. Includes severe and routine service schedules

    QUICK-LUBE and ILLUSTRATIONS: Fluid recommendations, capacities, drain plug torques, tire data, and severe service recommended preventive maintenance schedules. Information covers most 1998 GMC G25/G2500 VAN cars and light trucks sold in the U.S. and Canada from 1980+. Engine and chassis service images.

    • Automatic transmission/transaxles capacities, lubricant recommendations
    • Differential/final drive capacities, lube recommendations, grades, & viscosities
    • Final drive fill & drain plug torques
    • Number of lubrication fittings & plugs
    • Power steering, brake, & clutch fluid recommendations
    • Manual transmission/transaxle capacities, lube recommendations, grades, & viscosities
    • Number of lubrication fittings & plugs
    • Power steering, brake, & clutch fluid recommendations
    • Engine oil capacities, API grade recommendations, SAE viscosity recommendations, drain plug torque
    • Severe service maintenance & interval recommendations
    • Tire sizes, wheel nut/bolt torque, pressures & rim sizes
    • Transfer case capacities, lube recommendations, grades, & viscosities

    TUNE-UP & DRIVEABILITY SPECIFICATIONS: Most tune-up specifications for most 1998 GMC G25/G2500 VAN cars and light trucks sold in the U.S. and Canada from 1980+

    • Airflow sensor electrical specifications
    • Tensioning specifications for systems with automatic tensioners
    • Barometric pressure sensor specs
    • Battery group number and cranking performance
    • Crankshaft & camshaft position sensor resistance
    • Engine compression pressures
    • Coolant temperature sensor specs
    • Computer advance.
    • Diesel fuel temperature sensor resistance.
    • Distributor advance specifications
    • Ignition pickup coil resistance
    • Exhaust gas recirculation temperature sensor resistance
    • Engine fastener torque values
    • Firing order diagrams
    • Fuel system pressures
    • Generator (alternator) specs
    • Intake air temperature sensor specs
    • Ignition coil specifications
    • Fuel injector resistance
    • Engine idle speeds
    • Knock sensor resistance
    • Manifold absolute pressure sensor specs
    • Mixture control solenoid resistance
    • Voltage regulator specs
    • Spark plug applications & gaps
    • Starter motor electrical specs.
    • Tensioning specifications for systems without automatic tensioners
    • Throttle body temperature sensor resistance
    • Ignition timing in degrees at rpm
    • Transmission oil temperature sensor resistance
    • Throttle position sensor specs
    • Vacuum sensor valve specs

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