Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 132 (ENGINE CONTROLS - REMOVAL & INSTALLATION, OVERHAUL)AIR INDUCTION SYSTEMSAIR CLEANER ASSEMBLYINSTALLATION PROCEDURE

2003 Chevrolet TrailBlazer 4.2 S, 4WD

Installation Procedure

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Installation Procedure

WARNING: This page is about a different car, the 2002 Pontiac Grand Prix, 2002 Chevrolet Monte Carlo, 2002 Chevrolet Impala, 2002 Buick Regal, and 2002 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.

Install the air cleaner housing by pushing the cover (1) into the 2 rubber grommets (2) in the engine compartment.

Fig 1: Air Cleaner Assembly Components (1 Of 2)
Courtesy of GENERAL MOTORS CORP.
Install the PCM and the harness into the air cleaner housing (3).

Fig 2: Air Cleaner Assembly Components (2 Of 2)

Courtesy of GENERAL MOTORS CORP.

Install the air cleaner housing cover assembly (1).
NOTE: Refer to FASTENER NOTICE .
Install the 2 screws (2) to the air cleaner housing. Tighten the screws to 3 N.m (27 lb in).
Install the air cleaner intake duct. Refer to AIR CLEANER INTAKE DUCT .
Install the left inner fender brace. Refer to BRACE REPLACEMENT - FRONT FENDER UPPER DIAGON .

Install the air cleaner assembly by pushing the housing into the rubber grommets in the engine compartment.
Install the PCM (4) into the air cleaner housing (3).

Fig 1: PCM, Air Cleaner Housing & Cover
Courtesy of GENERAL MOTORS CORP.

RENDER: 1.0x

NO RELATED

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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.