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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 630 (POWER STEERING SYSTEM)REPAIR INSTRUCTIONSBLEEDING POWER STEERING SYSTEMTOOLS REQUIRED
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Tools Required

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Tools Required
WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  • J 35555  Metal Mityvac™
  • J 43485  Power Steering Bleeder Adapter

Important:  Hoses touching the frame, body, or engine may cause system noise.

  1. Verify that the hoses do not touch any other part of the vehicle.

    Important:  Loose connections may not leak, but could allow air into the steering system.

    Fig 1: Checking Power Steering Fluid Level
    G01666867Courtesy of GENERAL MOTORS CORP.
  2. Verify that all hose connections are tight.
    NOTE: If the power steering system has been serviced, an accurate fluid level reading cannot be obtained unless air is bled from the steering system. The air in the fluid may cause pump cavitation noise and may cause pump damage over a period of time.

    Important:  Maintain the fluid level throughout the bleed procedure.

  3. Remove the pump reservoir cap

    Important:  Use clean, new power steering fluid only.

  4. Fill the pump reservoir with fluid to the FULL COLD level.
  5. Attach the J 43485  to the J 35555  or equivalent.
  6. Place the J 43485  on or in the pump reservoir filler neck.
    7. Fig 2: Power Steering Bleeder Adapter & Vacuum Pump
    G01666868Courtesy of GENERAL MOTORS CORP.
  7. Apply a vacuum of 68 kPa (20 in Hg) maximum.
  8. Wait 5 minutes. Typical vacuum drop is 7-10 kPa (2-3 in Hg). If the vacuum does not remain steady, refer to Excessive Vacuum Drop Diagnosis .
  9. Remove the J 43485  and J 35555  .
  10. Reinstall the pump reservoir cap.
  11. Start the engine. Allow the engine to idle.
  12. Turn off the engine.
  13. Verify the fluid level. Repeat steps 11-13 until the fluid stabilizes.

    Important:  Do not turn steering wheel to lock.

  14. Start the engine. Allow the engine to idle.
  15. Turn the steering wheel 180-360 degrees in both directions 5 times.
  16. Switch the ignition off.
    NOTE: When adding fluid or making a complete fluid change, always use the proper power steering fluid. Failure to use the proper fluid will cause hose and seal damage and fluid leaks.
  17. Verify the fluid level.
  18. Remove the pump reservoir cap.
  19. Attach the J 43485  to the J 35555  or equivalent.
  20. Place the J 43485  on or in the pump reservoir filler neck.
  21. Apply a vacuum of 68 kPa (20 in Hg) maximum.
  22. Wait 5 minutes.
  23. Remove the J 43485  and the J 35555  .
  24. Verify the fluid level.
  25. Reinstall the pump reservoir cap.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.