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.
2003 Hummer H2FACTORY OEM SERVICE PROCEDURE
Removal Procedure
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Drain the starter/generator control module (SGCM) cooling system. Refer to Draining and Filling Cooling System - Starter/Generator Control Module .
- Remove the SGCM radiator outlet hose (1) from the SGCM radiator (2). Refer to Coolant Pipe Quick Connect Fitting - Starter/Generator Control Module .
- Remove the ambient air temperature sensor (2) from the SGCM radiator bracket (3).
- Disconnect the electrical connector from the SGCM cooling fan.
- Remove the bolts (1) from the SGCM radiator (5).
- Remove the SGCM radiator (5) from the radiator core support (4).
- Remove the bolts (4) from the SGCM cooling fan (3).
- Remove the SGCM cooling fan (3) from the SGCM radiator (2).
Factory Service Tools
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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.