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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 802 (POWER STEERING SYSTEM)REPAIR INSTRUCTIONSCHECKING AND ADDING POWER STEERING FLUID (WITH HYDROBOOST)
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Checking and Adding Power Steering Fluid (With Hydroboost)

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Checking and Adding Power Steering Fluid (With Hydroboost)
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: 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.
  1. If the power steering system has been serviced, bleed the power steering system to remove any trapped air from the system. Refer to Bleeding the Power Steering System .

    Important:  The oil level will appear falsely high if the hydro-boost accumulator is not fully charged. Do not apply the brake pedal with the engine off, this will discharge the hydro-boost accumulator.

  2. Fully charge the hydro-boost accumulator using the following procedure:
    • Start the engine.
    • Firmly apply the brake pedal 2 to 3 times.
    • Turn the engine Off.

    Important:  The Add and Cold Full marks on the capstick are calculated for oil at ambient temperature. If the oil is hot, the oil level may appear slightly high.

  3. Clean the area surrounding the reservoir cap.
  4. Remove the reservoir cap.

    Important:  The ideal oil level is between the Add and the Full Cold marks. Since overfilling is just as undesirable as underfilling, there is no reason to full all the way up to the Full Cold mark.

  5. Inspect the power steering pump fluid level at regular intervals.

    Add fluid when required.

  6. If the fluid level is low, add power steering fluid to the proper level.
  7. Install the reservoir cap.
  8. When checking the fluid level after servicing the steering system, bleed the air from the system. Refer to Bleeding the Power Steering System .
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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.