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 226 (ENGINE COOLING SYSTEM)
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Section 226 (Engine Cooling System)
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Section 226 (Engine Cooling System)
WARNING: This page is about a different car, the 2008 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
- Specifications
- Schematic and Routing Diagrams
- Diagnostic Information and Procedures
- Diagnostic Code Index
- Diagnostic Starting Point - Engine Cooling
- DTC P0480 or P0481 (with RPO LC3 or LH2)
- Diagnostic Instructions
- DTC Descriptors
- Diagnostic Fault Information
- Circuit/System Description
- Conditions for Running the DTC
- Conditions for Setting the DTC
- Action Taken When the DTC Sets
- Conditions for Clearing the DTC
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Repair Procedures
- DTC P0480, P0481, P0691, P0692, P0693, or P0694 (w/LLT)
- Diagnostic Instructions
- DTC Descriptors
- Diagnostic Fault Information
- Circuit/System Description
- Conditions for Running the DTC
- Conditions for Setting the DTC
- Action Taken When the DTC Sets
- Conditions for Clearing the MIL/DTC
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Component Testing
- Repair Procedures
- DTC P1258 (V6)
- DTC P1258 (with RPO LC3 or LH2)
- DTC P2600, P2602, or P2603
- Diagnostic Instructions
- DTC Descriptors
- Diagnostic Fault Information
- Typical Scan Tool Data
- Conditions for Running the DTC
- Conditions for Setting the DTC
- Action Taken When the DTC Sets
- Conditions for Clearing the DTC
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Component Testing
- Repair Procedures
- Symptoms - Engine Cooling
- Low Engine Coolant Indicator Always On (with RPO LC3 or LH2)
- Cooling Fan Always On (V6)
- Cooling Fan Always On (with RPO LC3 or LH2)
- Cooling Fan Inoperative (V6)
- Cooling Fan Inoperative (w/RPO LC3 or LH2)
- After Boil Coolant Pump Always On
- After Boil Coolant Pump Inoperative
- After Boil Coolant Pump Malfunction
- Engine Overheating
- Loss of Coolant (LC3)
- Loss of Coolant (LH2, LY7, LLT)
- Thermostat Diagnosis
- Coolant Heater Inoperative
- Engine Fails To Reach Normal Operating Temperature
- Pressure Cap Testing (Charge Air Cooling)
- Pressure Cap Testing (Powertrain)
- Coolant Leak Testing (Charge Air Cooling)
- Coolant Leak Testing (Powertrain)
- Fan Clutch Diagnosis
- Repair Instructions
- Cooling System Draining and Filling (Static Fill)
- Cooling System Draining and Filling (GE 47716)
- Charge Air Cooling System Coolant Level Inspection
- Charge Air Cooling System Draining and Filling (Vac N Fill)
- Charge Air Cooling System Draining and Filling (Static Fill)
- Flushing (Charge Air Cooling)
- Flushing (Powertrain)
- Radiator Cleaning (Powertrain)
- Radiator Cleaning (Charge Air Cooling)
- Radiator Surge Tank Replacement
- Charge Air Cooler Coolant Pipe Replacement
- Charge Air Cooler Coolant Reservoir Replacement
- Radiator Surge Tank Inlet Hose/Pipe Replacement (LLT)
- Radiator Surge Tank Inlet Hose/Pipe Replacement (LY7)
- Radiator Surge Tank Inlet Hose/Pipe Replacement (LH2)
- Radiator Surge Tank Outlet Hose/Pipe Replacement (LY7)
- Radiator Surge Tank Outlet Hose/Pipe Replacement (LH2)
- Radiator Inlet Hose Replacement (LLT)
- Radiator Inlet Hose Replacement (LY7)
- Radiator Inlet Hose Replacement (LH2)
- Radiator Outlet Hose Replacement (LY7)
- Charge Air Cooler Inlet Hose Replacement
- Charge Air Cooler Outlet Hose Replacement
- Auxiliary Water Pump Inlet Hose Replacement
- Auxiliary Water Pump Outlet Hose Replacement
- Engine Oil Cooler Connector Replacement
- Engine Oil Cooler Pipe/Hose Quick Connect Fitting
- Engine Oil Cooler Hose/Pipe Replacement
- Auxiliary Engine Oil Cooler Replacement
- Fan Replacement (LH2)
- Fan Replacement (LY7)
- Fan Adapter Replacement (LH2)
- Engine Cooling Fan Replacement
- Engine Coolant Fan Motor Replacement
- Engine Cooling Fan Bracket Replacement (LH2)
- Engine Coolant Thermostat Housing Replacement (LY7)
- Engine Coolant Thermostat Housing Replacement (LH2)
- Engine Coolant Thermostat Housing Replacement (LC3)
- Engine Coolant Thermostat Housing Replacement (LLT)
- Engine Coolant Thermostat Replacement (LH2)
- Engine Coolant Thermostat Replacement (LY7)
- Engine Coolant Thermostat Replacement (LC3)
- Engine Coolant Thermostat Replacement (LY7, LLT)
- Water Outlet Housing Replacement (LC3)
- Water Outlet Housing Replacement (LH2)
- Water Outlet Housing Replacement (LY7, LLT)
- Engine Coolant Inlet Pipe Replacement
- Coolant Bypass Hose Replacement (LH2)
- Coolant Bypass Hose Replacement (LC3)
- Water Pump Replacement (LY7, LLT)
- Water Pump Replacement (LC3)
- Water Pump Replacement (LH2)
- Auxiliary Water Pump Replacement (4.6L (LH2) w/RPOs V03/V92)
- Auxiliary Water Pump Replacement (LLT)
- Charge Air Cooler Outlet Pipe Assembly
- Charge Air Cooler Coolant Pump Replacement
- Fan Shroud Replacement (LH2)
- Fan Shroud Replacement (LY7)
- Radiator Replacement (LY7 Standard Cooling)
- Radiator Replacement (LH2 Heavy Duty Cooling)
- Radiator Replacement (LH2 Standard Cooling)
- Charge Air Cooler Radiator Replacement
- Coolant Heater Replacement (LH2, KO5)
- Coolant Heater Replacement (LH2, KA3)
- Coolant Heater Replacement (LC3 (K05))
- Coolant Heater Replacement (LY7, KO5, LLT)
- Coolant Heater Cord Replacement (LC3)
- Coolant Heater Cord Replacement (LY7, KO5)
- Coolant Heater Cord Replacement (LH2, K05, KA3)
- Coolant Heater Cord Replacement (LLT First Design)
- Coolant Heater Cord Replacement (LLT Second Design)
- Description and Operation
- Cooling Fan Description and Operation
- Cooling System Description and Operation
- Special Tools and Equipment
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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.