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 638 (ENGINE COOLING SYSTEM)REPAIR INSTRUCTIONSSURGE TANK REPLACEMENTREMOVAL PROCEDURE

2003 Chevrolet TrailBlazer 4.2 S, 4WD

Removal Procedure

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Removal Procedure

WARNING: This page is about a different car, the 2002 Oldsmobile Aurora and 2001 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.

Partially drain the engine coolant. Refer to Draining and Filling Cooling System .
Disconnect the surge tank inlet hose from the surge tank.

Fig 1: Disconnecting Surge Tank Inlet Hose
Courtesy of GENERAL MOTORS CORP.
Remove the secondary AIR relay bracket mounting nuts (2).
Remove the secondary AIR relay bracket (1).

Fig 2: Removing Secondary AIR Relay Bracket
Courtesy of GENERAL MOTORS CORP.
Remove the surge tank mounting screw (3) and nuts (2).
Disconnect the coolant level sensor.

Fig 3: Removing Surge Tank Mounting
Courtesy of GENERAL MOTORS CORP.
Using the J 37097-A release the clamp.
Remove the surge tank outlet hose from the surge tank.
Remove the surge tank.

Fig 4: Identifying Surge Tank
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.