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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 25 (HVAC SYSTEMS - AUTOMATIC)REMOVAL & INSTALLATIONCOMPRESSORREMOVAL & INSTALLATION (3.5L ENGINE)
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Removal & Installation (3.5L Engine)

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Removal & Installation (3.5L Engine)
WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
  1. Discharge A/C system, using approved refrigerant recovery/recycling equipment. Disconnect negative battery cable. Remove drive belt. Raise and support vehicle. Remove right front wheel. Remove 13 fasteners and remove front air deflector. See Figure. Remove 5 retainers for right front inner fender panel. Support front of engine cradle with a floor jack. Remove right front engine cradle bolt and lower cradle. Remove drive belt idler pulley.
  2. Disconnect suction and discharge hoses from Compressor. Remove generator mounting bolts and position generator out of way. Disconnect harness connector from compressor. Remove 2 upper compressor mounting bolts. Position generator and temporarily install idler pulley to hold generator out of the way. Loosen rear Compressor mounting nut and remove front mounting nut. Remove Compressor from engine block. Rotate compressor to allow Compressor to exit through wheelwell opening and remove compressor from vehicle. See Fig 1.
  3. Measure amount of oil drained from Compressor. Fill replacement compressor with 2.7 ounces of oil. If amount drained is more than amount specified, add amount drained. Reverse removal procedure and recharge A/C system. See TORQUE SPECIFICATIONS .
Fig 1: Identifying A/C Compressor (3.5 Liter)
G00305421Courtesy 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.