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 691 (ENGINE COOLING SYSTEM (1 OF 2))
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Section 691 (Engine Cooling System (1 Of 2))
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Section 691 (Engine Cooling System (1 Of 2))
WARNING: This page is about a different car, the 2006 GMC Sierra, 2006 GMC Cab & Chassis Sierra, 2006 Chevrolet Silverado, and 2006 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Specifications
- Schematic Wiring Diagrams
- Component Locator
- Diagnostic Information and Procedures
- Diagnostic Code Index
- Diagnostic Starting Point - Engine Cooling
- Scan Tool Output Controls
- Scan Tool Data List
- Scan Tool Data Definitions
- DTC B0159
- DTC B3844
- DTC P0480 or P0481
- DTC P1258
- DTC P0A01, P0A02, P0A03, P1A7A, P1A75, P1A76, P1A77, P1A78, or P1A79
- DTC P1AC0
- DTC P0A06 or P0A07
- DTC P1AC1 or P1AC2
- DTC P0A3E
- DTC P1A7E
- DTC P1A7F, P1A80, P1A81, P1A82, P1A83, P1A84, P1A85, or P1A86
- DTC P1A87
- Symptoms - Engine Cooling
- Engine Overheated Indicator Always On
- Engine Coolant Temperature Indicator Always On
- Low Engine Coolant Indicator Always On
- Cooling Fan Always On
- Cooling Fan Inoperative
- Engine Overheating
- Loss of Coolant
- Loss of Coolant - Starter/Generator Control Module
- Thermostat Diagnosis
- Coolant Heater Inoperative
- Engine Fails To Reach Normal Operating Temperature
- Pressure Cap Testing
- Pressure Cap Testing - Starter/Generator Control Module
- Coolant Leak Testing
- Coolant Leak Testing - Starter/Generator Control Module
- Starter Generator Control Module Coolant Pump Inoperative
- Starter Generator Control Module Cooling Fan Always On
- Starter Generator Control Module Cooling Fan Inoperative
- Fan Clutch Diagnosis
- Repair Instructions
- Draining and Filling Cooling System (w/RPO HP2)
- Draining and Filling Cooling System (w/o RPO HP2)
- Draining and Filling Cooling System - Starter/Generator Control Module
- Flushing
- Flushing - Starter/Generator Control Module
- Radiator Cleaning
- Cooling Fan - Starter/Generator Control Module Replacement
- Coolant Tank - Starter/Generator Control Module Replacement
- Coolant Tank Hose - Starter/Generator Control Module Replacement
- Coolant Pump - Starter/Generator Control Module Replacement
- Coolant Pump Inlet Hose - Starter/Generator Module Replacement
- Coolant Pump Outlet Hose - Starter/Generator Module Replacement
- Coolant Pipe Quick Connect Fitting - Starter/Generator Control Module
- Radiator - Starter/Generator Control Module Replacement
- Radiator Hose Outlet - Starter/Generator Control Module Replacement
- Cooler Pipe Inlet - Starter/Generator Stator Replacement
- Surge Tank Replacement
- Surge Tank Hose/Pipe Replacement - Inlet
- Radiator Hose Replacement - Inlet (4.3L)
- Radiator Hose Replacement - Inlet (4.8L, 5.3L, and 6.0L)
- Radiator Hose Replacement - Inlet (5.3L w/RPO HP2)
- Radiator Hose Replacement - Inlet (6.6L)
- Radiator Hose Replacement - Inlet (8.1L)
- Radiator Hose Replacement - Outlet (4.3L)
- Radiator Hose Replacement - Outlet (4.8L, 5.3L, and 6.0L)
- Radiator Hose Replacement - Outlet (5.3L w/RPO HP2)
- Radiator Hose Replacement - Outlet (6.6L)
- Radiator Hose Replacement - Outlet (8.1L)
- Radiator Hose Quick Connect Fitting
- Radiator Vent Inlet Hose Replacement
- Engine Oil Cooler Pipe/Hose Quick Connect Fitting
- Engine Oil Cooler Hose/Pipe Replacement (2WD)
- Engine Oil Cooler Hose/Pipe Replacement (4WD)
- Fan Replacement (Diesel)
- Fan Replacement (Gasoline)
- Fan Clutch Replacement (Diesel)
- Fan Clutch Replacement (Gasoline)
- Cooling Fan Pulley Replacement (6.6L (LLY) Engine)
- Cooling Fan Replacement - Electric
- Cooling Fan Motor Replacement - Electric
- Cooling Fan and Shroud Replacement
- Turbocharger Coolant Bypass Valve Replacement (6.6L (LLY) Engine)
- Turbocharger Coolant Hoses/Pipes Replacement (6.6L (LLY) Engine - Inlet Pipe)
- Turbocharger Coolant Hoses/Pipes Replacement (6.6L (LLY) Engine - Outlet Pipe)
- Exhaust Gas Recirculation (EGR) Coolant Hoses/Pipes Replacement (6.6L (LLY) Engine)
- Thermal Bypass Fitting Replacement (5.3L Engine w/RPO HP2)
- Thermal Bypass Hose Replacement (5.3L Engine w/RPO HP2)
- Water Outlet Tube Replacement (6.6L (LLY) Engine)
- Thermostat Housing Replacement (4.8L, 5.3L, and 6.0L Engines)
- Thermostat Replacement (4.3L Engine)
- Thermostat Replacement (6.6L (LLY) Engine)
- Thermostat Replacement (8.1L Engine)
- Thermostat Housing Crossover Replacement (6.6L (LLY) Engine)
- Coolant Crossover Pipe Replacement (8.1L)
- Coolant Air Bleed Pipe Assembly Replacement (4.8L, 5.3L, and 6.0L)
- Coolant Air Bleed Hose Replacement (4.8L, 5.3L, and 6.0L)
- Thermostat Bypass Pipes Replacement (6.6L (LLY))
- Water Pump Replacement (4.3L)
- Water Pump Replacement (4.8L, 5.3L, and 6.0L)
- Water Pump Replacement (6.6L (LLY))
- Water Pump Replacement (8.1L)
- Water Pump Outlet Pipe Replacement (6.6L (LLY))
- Water Pump Replacement - Auxiliary
- Fan Shroud Replacement - Upper (w/RPO HP2)
- Fan Shroud Replacement - Upper (Automatic Transmission - Diesel)
- Fan Shroud Replacement - Upper (Manual Transmission - Diesel)
- Fan Shroud Replacement - Upper (Automatic Transmission - Gasoline)
- Fan Shroud Replacement - Upper (Manual Transmission - Gasoline)
- Fan Shroud Replacement - Lower
- Radiator Replacement (4.3, 4.8, 5.3, and 6.0L)
- Radiator Replacement (Diesel)
- Radiator Replacement (8.1L)
- Radiator Air Baffle and Deflector Replacement - Side
- Radiator Air Baffle and Deflector Replacement - Upper
- Coolant Heater Replacement (4.3L)
- Coolant Heater Replacement (4.8L, 5.3L, and 6.0L)
- Coolant Heater Replacement (6.6L)
- Coolant Heater Replacement (8.1L)
- Coolant Heater Cord Replacement
- Description and Operation
- Cooling System Description and Operation
- Engine Coolant Indicators
- Cooling Fan Control - Two Fan System
- Coolant Level Control (If Equipped)
- Coolant Heater
- Auxiliary Coolant Pump (w/HP2)
- Cooling System
- Notes
- Cooling Cycle
- Cooling Cycle (6.6L Diesel Engine)
- Coolant
- Radiator
- Surge Tank
- Surge Tank (With 6.6L Diesel Engine)
- Pressure Cap
- Cooling Fan and Clutch
- Air Baffles and Seals
- Water Pump
- Water Pump (6.6L Diesel Engine)
- Thermostat
- Thermostats (6.6L Diesel Engine)
- Engine Oil Cooler
- Engine Oil Cooler (6.6L Diesel Engine)
- Transmission Oil Cooler
- Turbocharger Bypass Valve (6.6L Diesel Engine)
- Starter Generator Control Module Cooling System 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.