1988 GMC C3500 Service and Repair Manual

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Covers all 1988 C3500 trims — Sierra SLE Standard Cab Pickup 2-Door, Sierra Extended Cab Pickup 2-Door, Sierra SLE Extended Cab Pickup 2-Door +4 more ·
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1988 GMC C3500 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 SLX Cab & Chassis 2-Door
  • Sierra Cab & Chassis 2-Door
  • Sierra SLE Cab & Chassis 2-Door
  • Sierra Standard Cab Pickup 2-Door

Engines covered

  • 7.4L 454Cu. In. V8 GAS OHV Naturally Aspirated
  • 6.2L 379Cu. In. V8 DIESEL 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
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

No service bulletins No technical service bulletins on file with NHTSA for the 1988 GMC C3500.
19990408Component: SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS

WHILE DRIVING AT 45 MPH AND APPLYING BRAKES, BRAKES WENT STRAIGHT TO THE FLOORBOARD, AND CONSUMER LOST ALL POWER STEERING AND BRAKES. *AK

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