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.
2008 Hummer H3 L5-3.7LFACTORY OEM SERVICE PROCEDURE
Control Module HVAC: Locations
Front of the I/P Components
1 - Headlamp Switch
2 - Instrument Panel Cluster (IPC)
3 - Hazard Switch
4 - Accessory Switch
5 - Radio
6 - Ambient Light Sensor
7 - Inflatable Restraint I/P Module
8 - HVAC Control Module
9 - Accessory Power Outlet - I/P 1 and Accessory Power Outlet - I/P 2
10 - Window Wiper/Washer Switch - Rear
11 - Inflatable Restraint Steering Wheel Module
12 - Turn Signal/Multifunction Switch
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.
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