1986 GMC Astro Service and Repair Manual

1986 GMC Astro 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

• D9K042 Tractor Truck - High Tilt
• D9L064 Tractor Truck - Low Tilt
• D9L042 Tractor Truck - High Tilt
• D9K064 Straight Truck - High Tilt
• D9L042 Straight Truck - Low Tilt
• D9K020 Gliders - High Tilt
• D9L020 Gliders - High Tilt
• D9K064 Straight Truck - Low Tilt
• D9L064 Tractor Truck - High Tilt
• D9K064 Tractor Truck - High Tilt

Engines covered

• 14.0L 14013CC 855Cu. In. l6 DIESEL Turbocharged
• 9.0L 9047CC 552Cu. In. V6 DIESEL
• 12.1L 12063CC 736Cu. In. V8 DIESEL
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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