1989 GMC C3500 Service and Repair Manual
This factory service and repair manual for the 1989 GMC C3500 documents three engines — the 7.4L and 5.7L gasoline V8s and the 6.2L diesel V8 — in a chassis sold three ways, as a standard cab pickup, an extended cab pickup or a two-door cab and chassis. Sierra, Sierra SLE and Sierra SLX name the trim levels. What separates one of these trucks from the next is mostly engine and duty rather than body structure, and the manual is organized to suit that, dividing procedures, specifications, torque values, wiring diagrams and diagnostics by system.
Engines covered
- 7.4L V8 (454 cu in) — OHV, naturally aspirated, gasoline
- 6.2L V8 (379 cu in) — OHV, naturally aspirated, diesel
- 5.7L V8 (350 cu in) — OHV, naturally aspirated, gasoline
Body styles covered
- 2-door standard cab pickup
- 2-door extended cab pickup
- 2-door cab & chassis
Trims covered
- Sierra
- Sierra SLE
- Sierra SLX
Known issues on the 1989 C3500. Three recalls are on the federal record. One covers replacement oil filters that may not seal, letting engine oil escape toward an ignition source. Another describes transmission fluid pushed out of the vent tube by unexpected heat, where it can catch fire. The third concerns incorrect instructions for adjusting the rear lap-shoulder belts, so a belt set as directed would not restrain an occupant properly. One owner complaint, on the electrical system, rounds out the record. Lubrication, transmission and restraint procedures, their torque values and the wiring diagrams are the sections in play.
CERTAIN HONEYWELL FRAM RACING BRAND HP4 AND HP8 OIL FILTERS THAT WERE MANUFACTURED FROM MAY 25, 2006, THROUGH SEPTEMBER 14, 2007, AND SOLD FOR USE AS REPLACEMENT EQUIPMENT FOR VEHICLES LIST ABOVE. TH
THIS CONDITION MAY CAUSE INADEQUATE SEALING AND LOSS OF ENGINE OIL, POSSIBLY RESULTING IN A FIRE.
HONEYWELL WILL REPLACE THE AFFECTED OIL FILTERS FREE OF CHARGE. THE RECALL BEGAN DURING NOVEMBER 20
TRUCKS CAN CONTAIN INCORRECT INSTRUCTIONS ON HOW TO PROPERLY ADJUST REAR SEAT LAP-SHOULDER BELTS AS REQUIRED BY FMVSS 209.
INCORRECTLY ADJUSTED SEAT BELT WOULD NOT PROPERLYRESTRAIN OCCUPANT IN AN ACCIDENT OF SUDDEN STOP; TR
PROVIDE OWNER'S MANUAL INSERT CONTAINING THE CORRECT REAR LAP-SHOULDER BELT INSTRUCTIONS.
UNANTICIPATED HEAT IN THE TRANSMISSION CAN FORCE THE TRANSMISSION FLUID OUT OF THE VENT TUBE.
THE VENTED TRANSMISSION FLUID CAN CATCH FIRE IF EXPOSEDTO A SOURCE OF IGNITION.
INSTALL A LONGER TRANSMISSION VENT HOSE ROUTED TO THE LEFT SIDE OF THE ENGINE COMPARTMENT OF THE VEH
ELECTRICAL FIRE.
