1989 GMC S15 Service and Repair Manual

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Factory-Grade Data

1989 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
  • High Sierra 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

1989 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

NHTSA #93V00800014/01/1993Component: ENGINE AND ENGINE COOLING:COOLING SYSTEM:FAN

THE ENGINE COOLING FAN BLADES BREAK AS A RESULT OF FATIGUE AND/OR VEHICLE INDUCED STRESS.

Consequence

IF THE BLADE BREAKAGE OCCURS WHILE THE HOOD IS OPEN, APERSON WORKING UNDER THE HOOD OR IN THE VICINI

Remedy

INSTALL A NEWLY DESIGNED FAN ASSEMBLY.

TSB #10007838

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

19950607Component: SEAT BELTS:FRONT:BUCKLE ASSEMBLYCrash reported1 fatalities

SEAT BELT RELEASED DURING AN ACCIDENT,DRIVER WAS THROWN APPROXIMATELY 50 FEET FROM VEHICLE, RESULTING IN A FATALITY. *AK

19950607Component: SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTSCrash reported1 fatalities

BRAKES LOCKED UP, CAUSING VEHICLE TO LOSE CONTROL/SKID. *AK

19950208Component: ELECTRICAL SYSTEM:WIRING:FRONT UNDERHOODFire reported

VEHICLE CAUGHT FIRE WHILE DRIVING, UNDER THE HOOD FIRE, EA94-029 ACTIVE WILL PROVIDE INFORMATION. TT

20020710Component: SEATS1 injured1 fatalities

THE CONSUMER (WHO IS NOW DECEASED HAROLD BRIDGES) WAS DRIVING WHEN ALL OF A SUDDEN HE WAS REAR ENDED BY ANOTHER MOTORIST WHO WAS DRIVING RECKLESSLY, THE CONSUMERS SEAT ADJUSTER RAILING FAILED, WHICH A

20050124Component: EXTERIOR LIGHTING:TURN SIGNAL

CONSUMER HAD VEHICLE SERVICED SEVERAL TIMES FOR THE FRONT LEFT BLINKER. FOR SOME REASON THE OUTSIDE BLINKER STOPPED WORKING EVEN THOUGH THE INSIDE SIGNAL ON DASHBOARD STILL WORKED. *AK *NM

Showing the 5 most serious of 11 complaints filed with NHTSA.

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