1990 GMC C1500 Service and Repair Manual
This factory service and repair manual for the 1990 GMC C1500 has to serve a line that could be ordered as a two-door standard cab or a two-door extended cab pickup, in Sierra, Sierra SLE or Sierra SLX trim. Four naturally aspirated overhead-valve engines were available: the 4.3L V6, the 5.0L V8, the 5.7L V8 and the 6.2L diesel V8. Diesel injection and gasoline fuel systems are handled in separate sections, as are the two cab structures, so nothing has to be adapted from one configuration to another.
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 1990 C1500. Two recalls apply to this model year. One is an instruction error, in that the guidance shipped with the trucks for adjusting the rear lap-shoulder belts was wrong, and a belt adjusted to it may not hold an occupant properly in a sudden stop. The other is thermal: transmission fluid forced out of the vent tube by unexpected heat, which can then ignite. Seven owner complaints are logged with NHTSA, led by two on seat belts and two on the power train, with one on tires. Restraint, transmission and wheel-end service data all sit in this manual.
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
THE BRIDGESTONE DUELER H/T TIRES EXPERIENCED TREAD SEPARATION AND A BLOWOUT WHICH CAUSED DAMAGE TO THE VEHICLE, CONSUMER IS REQUESTING REIMBURSEMENT FOR DAMAGE AND TIRES. *MJS
THE DRIVER'S SIDE RED RELEASE BUTTON BROKE, CAUSING THE SEAT BELT NOT TO LATCH INTO BELT BUCKLE. *AK
DRIVER'S SIDE SEAT BELT BUCKLE BROKE, RED RELEASE BUTTON HAS BROKEN. TT
SIXTY-FORTY SPLIT SEAT; WHEN BRAKING, BACK REST WILL LEAN FORWARD W/ PASSENGER CAUSING ENTIRE BACK AND SEAT REST TO SLIDE FORWARD. KT
PURCHASE TRUCK NEW HAD TO REBUILD THE TRANSMISSION . TT
Showing the 5 most serious of 7 complaints filed with NHTSA.
