1990 GMC S15

Introduction

The 1990 GMC S15 is a compact pickup truck that offers a combination of versatility, ruggedness, and affordability. Known for its dependable V6 engine and available 4WD capabilities, the S15 is popular among enthusiasts and practical consumers alike. However, like any vehicle, it has its fair share of potential issues.

Engine

• 4.3L V6

  • Intake Manifold Gasket Failure
    • Description/Symptoms: Coolant and oil leaks from underneath the intake manifold, rough idle, and reduced engine power.
    • Solution: Replace the intake manifold gaskets.
    • Estimated Cost to Fix: $300 - $500+
    • Recalls: None Found

• 2.5L Inline-4

  • Head Gasket Failure
    • Description/Symptoms: Coolant leaks from the head gasket, overheating, and white smoke from the exhaust.
    • Solution: Replace the head gaskets.
    • Estimated Cost to Fix: $800 - $1200+
    • Recalls: None Found

Transmission

• 4L60 4-Speed Automatic

  • Transmission Slipping
    • Description/Symptoms: Transmission fails to engage gears properly, causing slipping or delayed shifting.
    • Solution: Rebuild or replace the transmission.
    • Estimated Cost to Fix: $1500 - $2500+
    • Recalls: None Found

• 5-Speed Manual

  • Clutch Failure
    • Description/Symptoms: Difficulty shifting gears, slipping, or grinding noises.
    • Solution: Replace the clutch assembly.
    • Estimated Cost to Fix: $500 - $800+
    • Recalls: None Found

Suspension

• Front Ball Joints
  • Description/Symptoms: Clicking or popping sounds when turning, uneven tire wear, and poor handling.
  • Solution: Replace the ball joints.
  • Estimated Cost to Fix: $200 - $400+ per side
  • Recalls: None Found
• Leaf Springs
  • Description/Symptoms: Sagging rear end, uneven ride height, and reduced load capacity.
  • Solution: Replace or reinforce the leaf springs.
  • Estimated Cost to Fix: $400 - $800+
  • Recalls: None Found

Electrical

• Alternator Failure
  • Description/Symptoms: Battery discharge, flickering lights, and dashboard warnings.
  • Solution: Replace the alternator.
  • Estimated Cost to Fix: $300 - $500+
  • Recalls: NHTSA Campaign Number 14V382000
• Starter Solenoid Failure
  • Description/Symptoms: Engine fails to crank, clicking noises when starting.
  • Solution: Replace the starter solenoid.
  • Estimated Cost to Fix: $100 - $200+
  • Recalls: None Found

Exterior

• Door Lock Actuator Failure
  • Description/Symptoms: Doors fail to lock or unlock remotely or manually.
  • Solution: Replace the door lock actuator.
  • Estimated Cost to Fix: $200 - $300+ per door
  • Recalls: None Found

Interior

• Power Window Motor Failure
  • Description/Symptoms: Windows fail to operate or become slow and intermittent.
  • Solution: Replace the power window motor.
  • Estimated Cost to Fix: $100 - $200+ per window
  • Recalls: None Found

Summary

While the 1990 GMC S15 is generally a reliable vehicle, it has several known issues that can be costly to repair if not addressed promptly. The most serious issues are related to the intake manifold gasket and head gasket failures, which can lead to engine damage. Other common issues include transmission slipping, suspension wear, and electrical problems. The severity and cost of these issues can vary depending on the extent of the damage and the availability of parts and labor.