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 DIAGNOSISHEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSHVAC SYSTEM - MANUALREPAIR INSTRUCTIONSAUXILIARY HVAC CONTROL PROCESSOR REPLACEMENTINSTALLATION PROCEDURE

2008 Chevrolet Chevy Express G3500, Van Passenger Extended

Installation Procedure

2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Installation Procedure

Fig 1: View Of HVAC Control Processor

GM699043

Courtesy of GENERAL MOTORS CORP.

Install the HVAC control processor (2) to the HVAC processor case (1).

Fig 2: Identifying HVAC Control Processor Access Cover

GM699042

Courtesy of GENERAL MOTORS CORP.

Install the HVAC control processor access cover (3).
Install the HVAC control processor to the roof panel.
Install the front headliner. Refer to Headlining Front Trim Panel Replacement .

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.