Section 249 (Engine Cooling System)
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2003 GMC Yukon XL, 2003 GMC Yukon, 2003 Chevrolet Tahoe, 2003 Chevrolet Suburban, and 2003 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
- Specifications
- Schematic and Routing Diagrams
- Component Locator
- Diagnostic Information and Procedures
- Diagnostic Starting Point - Engine Cooling
- Diagnostic System Check - Engine Cooling
- DTC P1258: Engine Coolant Temperature High
- Symptoms - Engine Cooling
- Symptom List
- Engine Overheated Indicator Always On
- Engine Coolant Temperature Indicator Always On
- Low Engine Coolant Indicator Always On
- Engine Overheating Diagnostic
- Loss Of Coolant Diagnostic
- Thermostat Diagnosis
- Thermostat Test Procedure Using Tempil-Sticks
- Thermostat Test Procedure Using Glycol
- Coolant Heater Inoperative
- Engine Fails To Reach Normal Operating Temperature
- Pressure Cap Testing
- Fan Clutch
- Repair Instructions
- Draining and Filling Cooling System
- 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 Quick Connect Fitting
- Radiator Hose Replacement - Inlet (4.8L, 5.3L, and 6.0L Engines)
- Radiator Hose Replacement - Inlet (8.1 L 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
- 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 (4.8L, 5.3L, and 6.0L Engines)
- 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 and Deflector Replacement - Side
- Radiator Air Baffle and Deflector Replacement - 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
- Special Tools and Equipment