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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 581 (ENGINE COOLING SYSTEM)REMOVAL AND INSTALLATIONHOSE REPLACEMENT
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Hose Replacement

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Hose Replacement
WARNING: This page is about a different car, the 2002 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

If you find any one of the above problems existing in the hoses, they should be replaced.

  1. Stop engine.
  2. Drain coolant. (Refer to "Draining the Coolant System" procedure in this section.)
  3. Slit hose end, twist left and right and pull straight off for easy removal.
    Fig 1: Removing Hose
    G01041285Courtesy of GENERAL MOTORS CORP.
  4. Clean off outlets with clean cloth. Use sandpaper if necessary.
  5. Dip ends of new hose into coolant for easier installation.
  6. Install clamps on hose (1).
  7. Install hose (2) onto nipple (3) until hose contacts hose stop bead (4) White line on hose should be at 12 o'clock position.
  8. Slide clamp (1) to within 3 mm (0.12 in.) of the hose end.
  9. Install pressure tester on bottle and check for leaks.
  10. Fill cooling system. (Refer to "Coolant Replacement" in this section of the service manual.)
    Fig 2: Installing Hose
    G01041286Courtesy of GENERAL MOTORS CORP.
RENDER: 1.0x

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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.