| 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 |
| 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 |
| Noise |
Air mixed in the engine coolant passage |
Insufficient air bleeding |
| 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 |