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 1375 (HEATING, VENTILATION AND AIR CONDITIONING)REPAIR INSTRUCTIONSCOMPRESSOR HOSE ASSEMBLY REPLACEMENTINSTALLATION 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 2004 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.

Install new O-rings lubricated with 525 viscosity mineral oil.
Position the compressor hose assembly into the vehicle.

Fig 1: Inlet Tube, Compressor, Suction Line, Bolts And Nuts

Courtesy of GENERAL MOTORS CORP.

Install the suction line (3) to the evaporator tube.

NOTE: Refer to Fastener Notice in Cautions and Notices.

Install the hose brackets to the vehicle. Secure with the 2 nuts (2).
Tighten: Tighten the nuts (2) to 10 N.m (89 lb in).
Install the compressor hose assembly to the compressor (6). Secure with the bolt (7).
Tighten: Tighten the compressor hose assembly bolt (7) to 25 N.m (18 lb ft).
Install the condenser inlet tube (12) to the condenser. Secure with the bolt (11).
Tighten: Tighten the bolt (11) to 5.4 N.m (48 lb in).
Evacuate and recharge the refrigerant system. Refer to Refrigerant Recovery and Recharging .
Operate the A/C system and test for refrigerant leaks. Refer to Leak Testing .

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.