1990 GMC K1500 Service and Repair Manual

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Factory-Grade Data

1990 GMC K1500 service and repair manual — a detailed, factory-style reference for maintenance, diagnostics, and repair. Use it to confirm correct procedures, specifications, and system coverage before you start work.

Designed for technicians and DIY owners, this manual helps you troubleshoot accurately, follow step-by-step repair procedures, and reference wiring diagrams and system sections quickly while you work.

What’s included

  • Step-by-step repair procedures and service information
  • Specifications and reference data (where provided)
  • Wiring diagrams and electrical sections
  • Powertrain, brakes, steering, suspension, HVAC and more

Trims covered

  • Sierra SLE Standard Cab Pickup 2-Door
  • Sierra Extended Cab Pickup 2-Door
  • Sierra SLE Extended Cab Pickup 2-Door
  • Sierra SLX Extended Cab Pickup 2-Door
  • Sierra SLX Standard Cab Pickup 2-Door
  • Sierra Standard Cab Pickup 2-Door

Engines covered

  • 5.0L 305Cu. In. V8 GAS OHV Naturally Aspirated
  • 6.2L 379Cu. In. V8 DIESEL OHV Naturally Aspirated
  • 4.3L 262Cu. In. V6 GAS OHV Naturally Aspirated
  • 5.7L 350Cu. In. V8 GAS OHV Naturally Aspirated

Index / Table of contents

  • Body
  • Brakes
  • Chassis Electrical
  • Driveline
  • Engine Cooling
  • Engine Electrical
  • Engine Mechanical
  • Engine Performance & Emission Controls
  • Fuel System
  • General Information & Identification
  • Heating, Ventilation, & Air Conditioning
  • Hybrid & Electric Vehicle Systems
  • Steering
  • Suspension
  • Transmission, Clutch, & Transfer Case
  • Wiring Diagrams

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Vehicle Safety Data

1990 GMC K1500 Recalls & Complaints

NHTSA #07E08800024/10/2007Component: EQUIPMENT

CERTAIN HONEYWELL FRAM RACING BRAND HP4 AND HP8 OIL FILTERS THAT WERE MANUFACTURED FROM MAY 25, 2006, THROUGH SEPTEMBER 14, 2007, AND SOLD FOR USE AS REPLACEMENT EQUIPMENT FOR VEHICLES LIST ABOVE. TH

Consequence

THIS CONDITION MAY CAUSE INADEQUATE SEALING AND LOSS OF ENGINE OIL, POSSIBLY RESULTING IN A FIRE.

Remedy

HONEYWELL WILL REPLACE THE AFFECTED OIL FILTERS FREE OF CHARGE. THE RECALL BEGAN DURING NOVEMBER 20

NHTSA #90V17000017/09/1990Component: SEAT BELTS:FRONT:ANCHORAGE

TRUCKS CAN CONTAIN INCORRECT INSTRUCTIONS ON HOW TO PROPERLY ADJUST REAR SEAT LAP-SHOULDER BELTS AS REQUIRED BY FMVSS 209.

Consequence

INCORRECTLY ADJUSTED SEAT BELT WOULD NOT PROPERLYRESTRAIN OCCUPANT IN AN ACCIDENT OF SUDDEN STOP; TR

Remedy

PROVIDE OWNER'S MANUAL INSERT CONTAINING THE CORRECT REAR LAP-SHOULDER BELT INSTRUCTIONS.

NHTSA #93V01600001/02/1993Component: POWER TRAIN:AUTOMATIC TRANSMISSION

UNANTICIPATED HEAT IN THE TRANSMISSION CAN FORCE THE TRANSMISSION FLUID OUT OF THE VENT TUBE.

Consequence

THE VENTED TRANSMISSION FLUID CAN CATCH FIRE IF EXPOSEDTO A SOURCE OF IGNITION.

Remedy

INSTALL A LONGER TRANSMISSION VENT HOSE ROUTED TO THE LEFT SIDE OF THE ENGINE COMPARTMENT OF THE VEH

TSB #634339

SOME CUSTOMERS MAY COMMENT ON FRONT DOOR HINGE PIN BUSHING WEAR, FRONT DOOR SAG, OR DOOR CHUCKING MOVEMENT IN EXTREME OPERATING CONDITIONS. *TT

19951204Component: POWER TRAIN:AUTOMATIC TRANSMISSIONCrash reportedFire reported

TRANSMISSION OVERHEATED AND CAUGHT FIRE. TT

20001023Component: PARKING BRAKE:CONVENTIONALCrash reported

TRUCK PARKING BRAKE DISENGAGED AND TRUCK ROLLED DOWN EMBANKMENT. *AK

19971218Component: SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED

EA94-038; IN SUDDEN STOP THE ABS BRAKING SYSTEM MALFUNCTIONED DUE TO THE BRAKE DRUMS/ROTORS BEING TOO SMALL FOR THIS SIZE OF VEHICLE, FOR THE VEHICLE, CAUSING EXTENDED STOPPING DISTANCE, MAY RESULT

19971218Component: SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:DRUM:DRUM

EA94-038; IN SUDDEN STOP THE ABS BRAKING SYSTEM MALFUNCTIONED DUE TO THE BRAKE DRUMS/ROTORS BEING TOO SMALL FOR THIS SIZE OF VEHICLE, FOR THE VEHICLE, CAUSING EXTENDED STOPPING DISTANCE, MAY RESULT

19971218Component: SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:DISC:ROTOR

EA94-038; IN SUDDEN STOP THE ABS BRAKING SYSTEM MALFUNCTIONED DUE TO THE BRAKE DRUMS/ROTORS BEING TOO SMALL FOR THIS SIZE OF VEHICLE, FOR THE VEHICLE, CAUSING EXTENDED STOPPING DISTANCE, MAY RESULT

Showing the 5 most serious of 6 complaints filed with NHTSA.

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