| Over-heating |
Insufficient engine coolant |
Engine coolant leaks |
| Engine coolant passage |
Clogged engine coolant passage |
| Radiator cap |
Damage or deterioration of radiator cap |
| Thermostat |
Thermostat stuck |
| Thermo control valve assembly |
Thermo control valve assembly malfunctioning |
| Water pump |
Damage of water pump |
| Damage of V-belt or defective V-belt tensioner |
| Radiator |
Clogged radiator fin |
| Radiator fan system |
Radiator fan system malfunction |
| Exhaust pipe |
Excessive back pressure in exhaust pipe |
| Cylinder block or cylinder head gasket etc. |
Engine oil leaking into engine coolant passage |
| Over cooling |
- |
Ambient temperature extremely low |
| Thermostat |
Stuck or damaged thermostat |
| Thermo control valve assembly |
Thermo control valve assembly stuck |
| Engine coolant leaks |
Thermostat cover |
Thermostat cover damaged |
| Gasket deterioration |
| Thermo control valve assembly |
Thermo control valve assembly damaged |
| Gasket deterioration |
| Water pump |
Damage of water pump |
| Gasket deterioration |
| Water hose |
Water hose damaged or deteriorated |
| Water hose connection loose |
| Water pipe |
Water pipe damaged |
| O-ring deterioration |
| Radiator |
Radiator damaged |
| Radiator drain plug O-ring deterioration |
| Damage or deterioration of radiator cap |
| Heater core |
Heater core damaged |
| Cylinder head or cylinder block |
Cylinder head or cylinder block damaged |
| Cylinder head or cylinder block warpage |
| Cylinder head gasket |
Cylinder head gasket deterioration |
| Noise |
Air mixed in the engine coolant passage |
Insufficient air bleeding |
| Thermo control valve assembly |
Thermo control valve assembly malfunctioning |
| Water pump |
Worn or damaged bearing |
| Radiator fan |
Deformation, cracks or other damage of radiator fan |
| Radiator fan motor |
Wear or damage inside the motor |