| 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 air flow over the radiator
|
- Check the coolant level and condition. Carry out a cooling system pressure test. Rectify any leaks as necessary.
- Test the thermostat and rectify as necessary
- Test the viscous fan operation, make sure the viscous fan rotates freely. Rectify as necessary
- 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
|
- Test the thermostat and rectify as necessary
- Test the viscous fan operation, make sure the viscous fan rotates freely
|