1989 GMC C1500 Service and Repair Manual
This factory service and repair manual for the 1989 GMC C1500 spans four engines and two cabs. The 4.3L V6, the 5.0L and 5.7L gasoline V8s and the 6.2L diesel V8 are all overhead-valve, naturally aspirated units, and each is documented on its own terms. Bodies run to the two-door standard cab and the two-door extended cab pickup, and the trim ladder has three rungs: Sierra, Sierra SLE and Sierra SLX. Specifications, torque values, wiring diagrams and diagnostic charts follow system by system.
Engines covered
- 5.0L V8 (305 cu in) — OHV, naturally aspirated, gasoline
- 6.2L V8 (379 cu in) — OHV, naturally aspirated, diesel
- 4.3L V6 (262 cu in) — OHV, naturally aspirated, gasoline
- 5.7L V8 (350 cu in) — OHV, naturally aspirated, gasoline
Body styles covered
- 2-door standard cab pickup
- 2-door extended cab pickup
Trims covered
- Sierra
- Sierra SLE
- Sierra SLX
Known issues on the 1989 C1500. Two recalls are on the federal record here. In the first, transmission heat higher than the design allowed for could force fluid out of the vent tube, where it can ignite near a source of ignition. In the second, trucks were supplied with incorrect instructions for adjusting the rear lap-shoulder belts, so a belt set by them might not restrain an occupant in a crash or a sudden stop. Four owner complaints are logged, split between the service brakes, the electrical system and the power train, all of which this manual covers with procedures, specifications and diagnostics.
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
SOME CUSTOMERS MAY COMMENT ON FRONT DOOR HINGE PIN BUSHING WEAR, FRONT DOOR SAG, OR DOOR CHUCKING MOVEMENT IN EXTREME OPERATING CONDITIONS. *TT
HAD PARKED VEHICLE. WENT TO REAR OF VEHICLE. HEARD A CRACKING SOUND. NOTICED SMOKE & THEN FIRE COMING FROM DASHBOARD AREA. PUT FLAMES OUT. DASHBOARD AREA WAS MELTED DOWN. REPORTED THE FIRE TO INSURANC
AFTER APPLYING BRAKES AND COMING TO A STOP, PEDAL EASES DOWN AND STARTS TO CREEP FORWARD UNLESS PRESSURE IS CONSTANTLY APPLIED. DEALER CAN NOT FIND THE CAUSE OF THE PROBLEM. *AK
MAKING A NORMAL OR SUDDEN STOP, BRAKES WILL BECOME SPONGY, GO TO FLOOR, CAUSING A LONGER STOPPING DISTANCE, AT LEAST 5 TIMES LONGER.DEALER HAS REPLACED MASTER CYLINDER/BOOSTER/ABS SYSTEM/ROTORS/CALIPE
MAKING A NORMAL OR SUDDEN STOP, BRAKES WILL BECOME SPONGY, GO TO FLOOR, CAUSING A LONGER STOPPING DISTANCE, AT LEAST 5 TIMES LONGER.DEALER HAS REPLACED MASTER CYLINDER/BOOSTER/ABS SYSTEM/ROTORS/CALIPE
MAKING A NORMAL OR SUDDEN STOP, BRAKES WILL BECOME SPONGY, GO TO FLOOR, CAUSING A LONGER STOPPING DISTANCE, AT LEAST 5 TIMES LONGER.DEALER HAS REPLACED MASTER CYLINDER/BOOSTER/ABS SYSTEM/ROTORS/CALIPE
Showing the 5 most serious of 8 complaints filed with NHTSA.
