1988 GMC S15 Service and Repair Manual

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Factory-Grade Data

1988 GMC S15 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

  • Base Extended Cab Pickup 2-Door
  • Base Standard Cab Pickup 2-Door
  • Sierra Classic Extended Cab Pickup 2-Door
  • Gypsy Extended Cab Pickup 2-Door
  • High Sierra Standard Cab Pickup 2-Door
  • Base Cab & Chassis 2-Door
  • Gypsy Standard Cab Pickup 2-Door
  • High Sierra Extended Cab Pickup 2-Door
  • Sierra Classic Standard Cab Pickup 2-Door

Engines covered

  • 2.8L 173Cu. In. V6 GAS OHV Naturally Aspirated
  • 4.3L 262Cu. In. V6 GAS OHV Naturally Aspirated
  • 2.5L 2474CC 151Cu. In. l4 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

1988 GMC S15 Recalls & Complaints

NHTSA #06E04900024/05/2006Component: EXTERIOR LIGHTING

CERTAIN CK MOTORSPORTS COMBINATION HEADLIGHTS, CLEAR CORNER, BUMPER, AND SIDE MARKER LIGHTS SOLD AS REPLACEMENT LAMPS FOR USE ON THE PASSENGER VEHICLES LISTED ABOVE. SOME COMBINATION LAMPS THAT ARE N

Consequence

WITHOUT THE AMBER REFLECTORS, THE VEHICLE WILL BE POORLY ILLUMINATED, POSSIBLY RESULTING IN A VEHICL

Remedy

CK MOTORSPORT WILL NOTIFY OWNERS AND REPLACE THE NONCOMPLIANT LAMPS FREE OF CHARGE. THE RECALL BEGA

NHTSA #06E02600023/03/2006Component: EXTERIOR LIGHTING

CERTAIN PRO-A MOTORS CORNER LAMPS, TURN SIGNALS, AND HEADLIGHTS SOLD AS REPLACEMENT LAMPS FOR USE ON CERTAIN PASSENGER VEHICLES LISTED ABOVE. SOME COMBINATION LAMPS THAT ARE NOT EQUIPPED WITH AMBER S

Consequence

WITHOUT THE AMBER REFLECTORS, THE VEHICLE WILL BE POORLY ILLUMINATED, POSSIBLY RESULTING IN A VEHICL

Remedy

PRO-A MOTORS WILL NOTIFY OWNERS AND OFFER TO REPURCHASE THE LAMPS. THE RECALL BEGAN ON APRIL 3, 200

TSB #10007838

DIAGNOSTIC INFORMATION FOR INTERMITTENT TRANSMISSION DOWNSHIFT, SLIP, BUSY/CYCLING TCC OR NOISY COOLING FAN. *TT

19961211Component: SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED

ABS BRAKES, WHEN BRAKES ARE APPLIED PEDAL GOES TO THE FLOOR, IN FOR REPAIRS, NO LEAK AND CONTINUES LOSS OF EFFECTIVENESS. *AK

19950711Component: SEAT BELTS:FRONT:BUCKLE ASSEMBLY

THE DRIVERS SIDE SEATBELT DOES NOT LATCH AND RELEASES ON ITS ON. PLEASE DESCRIBE.

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