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 G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1450 (ENGINE COOLING SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESLOW ENGINE COOLANT INDICATOR ALWAYS ONCIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Circuit/System Testing
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Circuit/System Testing
WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
Circuit/System Verification must be performed before performing the Circuit/System Testing.
- Turn ON the ignition, with the engine OFF.
- Verify that the low coolant indicator turns ON and OFF with each command when the instrument cluster indicators are commanded ON and OFF with a scan tool.
- If the low coolant level indicator does NOT turn ON, test for poor connections at the IPC or a faulty IPC.
- Ignition ON, disconnect the coolant level switch.
- If the low coolant level indicator turns OFF with the switch disconnected, test the coolant level switch signal circuit for a short to ground.
- If the low coolant level indicator does not turn OFF with the switch disconnected, replace the coolant level switch.
- If the signal circuit tests normal, inspect for poor connections at the BCM or a faulty BCM.
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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.