1989 GMC R1500 Suburban Service and Repair Manual
This factory service and repair manual for the 1989 GMC R1500 Suburban documents the four-door sport utility in Base and Sierra Classic trim, powered by either a 5.7L gasoline V8 of 350 cubic inches or a naturally aspirated 6.2L diesel V8 of 379 cubic inches, both overhead-valve designs. One body, two trims and two very different engines make for a narrow specification, and that lets the book go deep: procedures, specifications, torque values, wiring diagrams and diagnostics are given for each system rather than summarized across a range.
Engines covered
- 6.2L V8 (379 cu in) — OHV, naturally aspirated, diesel
- 5.7L V8 (350 cu in) — OHV, naturally aspirated, gasoline
Body styles covered
- 4-door sport utility
Trims covered
- Base
- Sierra Classic
Known issues on the 1989 R1500 Suburban. One recall touches this model year. It involves replacement oil filters sold for these trucks that could seal poorly at the mounting face and let engine oil escape, with fire the possible outcome. A single owner complaint is also on the federal record, and it concerns the service brakes. Both point at routine work under the hood and under the truck, and the manual supports it with lubrication system specifications and torque values, and with the brake hydraulic procedures, dimensions and diagnostics a brake concern on a vehicle this heavy calls for.
