| Coolant loss |
- Hoses
- Hose connections
- Radiator
- Coolant pump
- Heater core
- Gaskets
- Engine casting cracks
- Cylinder block core plugs
- Thermostat
- Coolant pipes and joins
- Coolant Degassing lines and degassing point plugs
- Main radiator and auxiliary radiators
- Charge air cooler circuit leaks
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- Complete a visual inspection. If there are no obvious leaks, complete a cooling system pressure test. Rectify any leaks as necessary.
- If overheating event is suspected perform actions in overheating section after fixing the leak
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| Overheating |
- Low/Contaminated coolant
- Thermostat
- Viscous fan
- ECT sensor
- Restricted air flow over the radiator
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- Check the coolant level and condition.
- Complete a cooling system pressure test. Rectify any leaks as necessary.
- Check the thermostat and rectify as necessary.
- Check the viscous fan operation, make sure the viscous fan rotates freely.
- Check for obstructions to the air flow over the radiator. Rectify as necessary.
- Check Active grille operation
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| Engine not reaching normal temperature |
- Thermostat
- Viscous fan
- Thermostat
- Electric fan
- Fan speed module
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- Check the thermostat operation. Check the viscous fan operation, make sure the viscous fan is not seized. Rectify as necessary.
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| Message centre displays "Coolant Level Low" warning message |
- Coolant loss
- Engine coolant level sensor fault
- Engine coolant level sensor circuit fault
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