| Coolant loss |
- Hoses
- Hose connections
- Radiator
- Water pump
- Heater core
- Gaskets
- Engine casting cracks
- Engine block core plugs
|
Carry out a visual inspection. If there are no obvious leaks, carry out a cooling system pressure test. Rectify any leaks as necessary. |
| Overheating |
- Low/Contaminated coolant
- Thermostat
- Viscous fan
- ECT sensor
- Restricted airflow over the radiator
|
Check the coolant level and condition. Carry out 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. |
| Engine not reaching normal temperature |
- Thermostat
- Viscous fan
- Thermostat
- Electric fan
- Fan speed module
|
Check the thermostat operation. Check the viscous fan operation, make sure the viscous fan is not seized. Rectify as necessary. |