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 MANUALSCHEVROLET2002CHEVY EXPRESS G3500, VAN PASSENGER EXTENDED, 8.1 GREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE MECHANICALCOOLING SYSTEM (MECHANICAL)ENGINE COOLING SYSTEM
2002 Chevrolet Chevy Express G3500, Van Passenger Extended, 8.1 G
Engine Cooling System
2002 Chevrolet Chevy Express G3500, Van Passenger Extended, 8.1 GSECTION Engine Cooling System
- Specifications
- Schematic and Routing Diagrams
- Component Locator
- Diagnostic Information and Procedures
- Diagnostic Starting Point - Engine Cooling
- Diagnostic System Check - Engine Cooling
- Scan Tool Data List
- Scan Tool Data Definitions
- Diagnostic Trouble Code (DTC) List
- DTC P1258
- Symptoms - Engine Cooling
- Low Engine Coolant Indicator Always On
- Engine Overheating
- Loss of Coolant
- Thermostat Diagnosis
- Coolant Heater Inoperative
- Engine Fails To Reach Normal Operating Temperature
- Fan Clutch Diagnosis
- Repair Instructions
- Draining and Filling Cooling System
- Flushing
- Radiator Cleaning
- Surge Tank Replacement
- Coolant Recovery Reservoir Replacement
- Radiator Hose Replacement - Inlet
- Radiator Hose Replacement - Outlet
- Engine Oil Cooler Hose/Pipe Replacement
- Engine Oil Cooler Replacement - Auxiliary
- Fan Clutch Replacement
- Thermostat Replacement (4.3L)
- Thermostat Replacement (5.0L and 5.7L)
- Thermostat Replacement (6.5L)
- Thermostat Replacement (8.1L)
- Thermostat Housing Crossover Replacement (6.5L)
- Water Crossover Replacement (8.1L)
- Coolant Bypass Hose Replacement
- Water Pump Replacement (4.3L, 5.0L, and 5.7L)
- Water Pump Replacement (6.5L)
- Water Pump Replacement (8.1L)
- Engine Coolant Temperature Sensor Replacement
- Drain Cock Replacement
- Fan Shroud Replacement
- Radiator Replacement
- Coolant Heater Replacement (5.0L and 5.7L)
- Coolant Heater Replacement (4.3L)
- Coolant Heater Replacement (6.5L)
- Coolant Heater Replacement (8.1L)
- Coolant Heater Cord Replacement
- Description and Operation
- Special Tools and Equipment
RENDER: 1.0x
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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.