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 MANUALSCHEVROLET2008CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 146 (HVAC SYSTEM - AUTOMATIC)REPAIR INSTRUCTIONSHVAC CONTROL MODULE REPLACEMENTINSTALLATION PROCEDURE

2008 Chevrolet Chevy Express G3500, Van Passenger Extended

Installation Procedure

2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Installation Procedure

WARNING: This page is about a different car, the 2008 Chevrolet Malibu Classic. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT: The key should be in the OFF position when connecting the electrical connectors to ensure proper calibration.

Install the HVAC control module wire harness connectors.

Fig 1: Identifying HVAC Control Module

Courtesy of GENERAL MOTORS CORP.

Install the HVAC control module.

NOTE: Refer to Fastener Notice .

Tighten the HVAC control module screws.
Tighten: Tighten the screws to 2.5 N.m (22 lb in).
Install the I/P center trim panel. Refer to Instrument Panel Center Trim Panel Replacement .

IMPORTANT: Do not adjust any controls on the HVAC control module while the HVAC control module is calibrating. If interrupted improper HVAC performance will result.

Start the engine and let run for one minute.
Refer to Control Module References for programming and setup information.

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.