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 1443 (HVAC SYSTEMS - GENERAL SERVICING)REPAIR INSTRUCTIONSACCUMULATOR REPLACEMENTINSTALLATION PROCEDURE

2003 Chevrolet TrailBlazer 4.2 S, 4WD

Installation Procedure

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Installation Procedure

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT: If replacing the accumulator, add the refrigerant oil to the accumulator. Refer to Refrigerant System Capacities for the capacity information.

Install the accumulator to the vehicle.
Install the accumulator into the accumulator clamp.

NOTE: Refer to FASTENER NOTICE in Cautions and Notices.

Install the accumulator clamp nut.
Tighten: Tighten the nut to 10 N.m (88 lb in).
Install the A/C low pressure switch.
Tighten: Tighten the A/C low pressure switch to 5 N.m (44 lb in).

Fig 1: Accumulator

Courtesy of GENERAL MOTORS CORP.

Install new O-ring seals. Refer to O-Ring Replacement .
Install the accumulator to the evaporator.
Install the accumulator retaining nut.
Tighten: Tighten the nut to 28 N.m (21 lb ft).
Connect the compressor suction hose to the accumulator (4).
Install the suction hose nut.
Tighten: Tighten the nut to 48 N.m (35 lb ft).
Connect the electrical connector to the A/C low pressure switch.
Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .
Leak test the fitting of the component using the J 39400-A . See Special Tools and Equipment .

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.