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 MANUALSCHEVROLET2002AVALANCHE 2500, RWDREPAIR AND DIAGNOSISENGINE MECHANICALCOOLING SYSTEM (MECHANICAL)ENGINE COOLING SYSTEM
2002 Chevrolet Avalanche 2500, RWD
Engine Cooling System
2002 Chevrolet Avalanche 2500, RWDSECTION 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 Output Controls
- Scan Tool Data List
- Scan Tool Data Definitions
- Diagnostic Trouble Code (DTC) List
- DTC P1258
- Symptoms - Engine Cooling
- Engine Overheated Indicator Always On
- Engine Coolant Temperature Indicator Always On
- Low Engine Coolant Indicator Always On
- Engine Overheating
- Loss of Coolant
- Thermostat Diagnosis
- Coolant Heater Inoperative
- Engine Fails To Reach Normal Operating Temperature
- Pressure Cap Testing
- Coolant Leak Testing
- Fan Clutch Diagnosis
- Repair Instructions
- Draining and Filling Cooling System
- Flushing
- Radiator Cleaning
- Surge Tank Replacement
- Surge Tank Hose/Pipe Replacement - Inlet
- Surge Tank Hose/Pipe Replacement - Outlet (4.8L, 5.3L, and 6.0L Engines)
- Radiator Hose Replacement - Inlet (4.8L, 5.3L, and 6.0L Engines)
- Radiator Hose Replacement - Inlet (8.1L Engine)
- Radiator Hose Replacement - Outlet (4.8L, 5.3L, and 6.0L Engines)
- Radiator Hose Replacement - Outlet (8.1L Engine)
- 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
- Fan Clutch Replacement
- Thermostat Housing Replacement (4.8L, 5.3L, and 6.0L Engines)
- Thermostat Replacement (8.1L Engine)
- Water Crossover Replacement (8.1L Engine)
- Coolant Air Bleed Pipe Assembly Replacement (4.8L, 5.3L, and 6.0L Engines)
- Coolant Air Bleed Hose Replacement
- Water Pump Replacement (4.8L, 5.3L, and 6.0L Engines)
- Water Pump Replacement (8.1L Engine)
- Drain Cock Replacement
- Fan Shroud Replacement - Upper (W/O M74)
- Fan Shroud Replacement - Upper (W/M74)
- Fan Shroud Replacement - Lower
- Radiator Replacement
- Radiator Air Baffle Assemblies and Deflectors (Side)
- Radiator Air Baffle Assemblies and Deflectors (Upper)
- Coolant Heater Replacement (Dealer Installation - 6.0L Engine)
- Coolant Heater Replacement (4.8L, 5.3L, and 6.0L Engines)
- Coolant Heater Replacement (8.1L Engine)
- Coolant Heater Cord Replacement
- Description and Operation
- Cooling System Description and Operation
- Engine Coolant Indicators
- Cooling Fan Control - Two Fan System
- Coolant Level Control
- Coolant Heater
- Cooling System
- Notes
- Cooling Cycle
- Cooling Cycle (6.6L Diesel Engine)
- Coolant
- Radiator
- Surge Tank
- 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)
- 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.