1990 GMC G25/G2500 VAN REPAIR MANUAL -- HOW TO FIX YOUR CAR OR TRUCK

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1990 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 1990 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 1990 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:

BRAKE SERVICE PROCEDURES FOR 1990 GMC G25/G2500 VAN AUTOMOBILES

ANTI-LOCK BRAKES, GENERAL MOTORS -> Four Wheel Anti-Lock Brake System -> SYSTEM SERVICE -> BLEEDING EHCU MODULE
Vehicle: 1990 GMC G25/G2500 VAN Rally 5.7 V8 GAS

BLEEDING EHCU MODULE

The EHCU Module should be bled after replacement or if trapped air is in the unit. If bleeding is required the module must be bled thoroughly before the wheel cylinders and calipers.

There are two bleeders on top of the unit that appear to be normal bleeders, Fig. . These are modulator bleeders and must remain closed when the unit is not pressurized.

The internal bleeders are on either side of EHCU module. The valves are used to open the internal passages within the EHCU module. Both bleed valves must be rotated 1/4-1/2 a turn counterclockwise before beginning t...

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FUEL FILTER REPLACEMENT PROCEDURES FOR 1990 GMC G25/G2500 VAN AUTOMOBILES

General Motors Corp./Saturn Light Trucks, SUVs & Vans -> Component Locations -> Late 1986-06 Chevrolet & GMC G Series w/Gasoline Engines
Vehicle: 1990 GMC G25/G2500 VAN Vandura 4.3 V6 GAS

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DRIVELINE, U-JOINT & CV AXLES REPLACEMENT PROCEDURES FOR 1990 GMC G25/G2500 VAN AUTOMOBILES

DRIVESHAFT, Replace -> One Piece Driveshaft -> Two Piece Driveshaft
Vehicle: 1990 GMC G25/G2500 VAN Vandura 4.3 V6 GAS

One Piece Driveshaft
  • Raise and support vehicle.
  • Mark rear universal joint to drive shaft flange.
  • Remove retaining bolts and clamps.
  • Remove propeller shaft from pinion drive flange.
  • Remove propeller shaft from transmission/transfer case.
  • Using tape or a rubber band, wrap the U-Joint bearing caps to ensure bearing caps do not separate from U-Joint.
  • Reverse procedure to install, noting the following:
    • Align reference marks made during removal.
    • Torque yoke retainer bolts to 18 ft. lbs.
Two Piece Driveshaft
  • Raise and support vehicle.
  • Suppor...

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STARTER & ALTERNATOR REPLACEMENT PROCEDURES FOR 1990 GMC G25/G2500 VAN AUTOMOBILES

Alternator, Replace
Vehicle: 1990 GMC G25/G2500 VAN Vandura 5.0 V8 GAS

  • Disconnect battery ground cable.
  • Disconnect terminal plug and battery lead from rear of alternator.
  • Remove accessory drive belt.
  • Remove alternator mounting bolts.
  • Separate alternator from mounting bracket.
  • Rem...

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MAINTENANCE LAMP RESET PROCEDURES FOR 1990 GMC G25/G2500 VAN AUTOMOBILES

General Motors Corp./Saturn Trucks -> Check Fuel Cap Lamp ->
Vehicle: 1990 GMC G25/G2500 VAN Vandura 5.7 V8 GAS

The Check Fuel Cap Lamp will illuminate momentarily when the ignition switch is placed in the On position as a bulb check. I...

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RADIATOR & HOSE REPLACEMENT PROCEDURES FOR 1990 GMC G25/G2500 VAN AUTOMOBILES

Coolant Hose, Replace -> Lower -> Upper
Vehicle: 1990 GMC G25/G2500 VAN Vandura 5.0 V8 GAS

Lower

  • Drain cooling system into a suitable container.
  • Reposition hose clamp at radiator outlet and remove hose.
  • Reposition hose clamp at water pump inlet and remove hose.
  • Remove hose from vehicle.
  • Reverse procedure...

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SERPENTINE BELT SERVICE PROCEDURES FOR 1990 GMC G25/G2500 VAN AUTOMOBILES

Serpentine Drive Belt, Replace
Vehicle: 1990 GMC G25/G2500 VAN Vandura 5.0 V8 GAS

  • Rotate tensioner counterclockwise, using a 1/2 inch breaker bar with a socket placed on tensioner ...

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COMPONENT LOCATION DIAGRAMS FOR 1990 GMC G25/G2500 VAN AUTOMOBILES

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

Vehicle Speed Sensor Diagram for 1990 GMC G25/G2500 VAN Rally 4.3 V6 GASVehicle Speed Sensor Diagram for 1990 GMC G25/G2500 VAN Rally 4.3 V6 GAS

Components on diagram:
  • Vehicle Speed Sensor
    • Fuel Module Diagram for 1990 GMC G25/G2500 VAN Vandura 4.3 V6 GASFuel Module Diagram for 1990 GMC G25/G2500 VAN Vandura 4.3 V6 GAS

    Components on diagram:
  • Fuel Module

    • CLICK HERE TO GET FULL ACCESS TO 1990 GMC G25/G2500 VAN PARTS/COMPONENTS LOCATION DIAGRAMS!

    WIRING DIAGRAMS FOR 1990 GMC G25/G2500 VAN AUTOMOBILES

    OEM drawn wiring diagrams for most 1990 GMC G25/G2500 VAN cars and light trucks sold in the U.S.

    1990 GMC G25/G2500 VAN Vandura 6.2 V8 DIESEL Wiring Diagram1990 GMC G25/G2500 VAN Vandura 6.2 V8 DIESEL Wiring Diagram

    Components on diagram:
  • Brake Switch
  • Clutch Start Switch
  • Cruise Control Module
  • Cruise Control Servo
  • Digital Ratio Adapter
    • 1990 GMC G25/G2500 VAN Vandura 4.3 V6 GAS Wiring Diagram1990 GMC G25/G2500 VAN Vandura 4.3 V6 GAS Wiring Diagram

    Components on diagram:
  • LH Side Marker Lamp
  • RH Side Marker Lamp
  • LH Headlamp Connector

    • CLICK HERE TO GET FULL ACCESS TO 1990 GMC G25/G2500 VAN WIRING DIAGRAMS!

    TECHNICAL SERVICE BULLETINS FOR 1990 GMC G25/G2500 VAN AUTOMOBILES

    OEM TSB listings for most 1990 GMC G25/G2500 VAN cars and light trucks sold in the U.S. from 1985+.

    Document: Car and Truck Fix It Right the First Time Issues
    Vehicle: 1990 GMC G25/G2500 VAN Rally 4.3 V6 GAS

    Auto Systems:
  • Labor Times, Manuals, Warranty, Aids
    • Document: GM TIRE WARRANTY PROGRAM CLAIMS GOODWILL GUIDELINES - REVISED
    Vehicle: 1990 GMC G25/G2500 VAN Rally 4.3 V6 GAS

    Auto Systems:
  • Labor Times, Manuals, Warranty, Aids
  • Wheels, Tires, Wheel Bearings, Seals, Hubs

    • CLICK HERE TO GET FULL ACCESS TO 1990 GMC G25/G2500 VAN TECHNICAL SERVICE BULLETINS!

    COMPONENT/PARTS SPECIFICATIONS FOR 1990 GMC G25/G2500 VAN AUTOMOBILES

    BRAKE SPECIFICATIONS: Brake drum, rotor, caliper, and related specifications for most 1990 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 1990 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 1990 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 1990 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

    CLICK HERE TO GET FULL ACCESS TO 1990 GMC G25/G2500 VAN SPECIFICATIONS DATA!

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