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 MANUALSPONTIAC2008GRAND PRIX BASEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 226 (ENGINE COOLING SYSTEM)
2008 Pontiac Grand Prix Base
Section 226 (Engine Cooling System)
2008 Pontiac Grand Prix BaseSECTION Section 226 (Engine Cooling System)
WARNING: This page is about a different car, the 2007 Pontiac Grand Prix. 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 Code Index
- Diagnostic Starting Point - Engine Cooling
- Scan Tool Output Controls
- Scan Tool Data List
- DTC P0480 or P0481
- DTC P1258
- Symptoms - Engine Cooling
- Engine Coolant Temperature Indicator Always On
- Cooling Fan Always On
- Cooling Fan Inoperative
- Engine Overheating
- Loss of Coolant
- Thermostat Diagnosis (Overheating)
- Thermostat Diagnosis (Slow to Heat)
- Coolant Heater Inoperative
- Engine Fails To Reach Normal Operating Temperature
- Pressure Cap Testing
- Coolant Leak Testing
- Repair Instructions
- Draining and Filling Cooling System (L26, L32 GE 47716 Fill)
- Draining and Filling Cooling System (L26, L32 Static Fill)
- Draining and Filling Cooling System (LS4 GE 47716 Fill)
- Draining and Filling Cooling System (LS4 Static Fill)
- Flushing
- Radiator Cleaning
- Coolant Recovery Reservoir Replacement (LS4)
- Coolant Recovery Reservoir Replacement (L26, L32)
- Radiator Inlet Hose Replacement (LS4)
- Radiator Inlet Hose Replacement (L26, L32)
- Radiator Outlet Hose Replacement (LS4)
- Radiator Outlet Hose Replacement (L26, L32)
- Cooling Fan Motor Replacement - Electric (LS4)
- Cooling Fan Motor Replacement - Electric (L26, L32)
- Engine Coolant Thermostat Housing Replacement (LS4)
- Engine Coolant Thermostat Housing Replacement (L26/L32)
- Thermostat Replacement (LS4)
- Thermostat Replacement (L26/L32)
- Coolant Air Bleed Pipe Assembly Replacement (LS4)
- Coolant Air Bleed Hose Replacement (LS4)
- Water Pump Replacement (LS4)
- Water Pump Replacement (L26/L32)
- Coolant Pump Manifold Replacement (LS4)
- Radiator Drain Cock Replacement
- Fan Shroud Replacement (LS4)
- Fan Shroud Replacement (L26, L32)
- Radiator Replacement (LS4)
- Radiator Replacement (L26, L32)
- Radiator Air Lower Baffle and Deflector Replacement
- Radiator Air Upper Baffle and Deflector Replacement
- Coolant Heater Replacement (LS4)
- Coolant Heater Replacement (L26/L32)
- Coolant Heater Cord Replacement (L26/L32)
- Coolant Heater Cord Replacement (LS4)
- 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.