Overheat
- Insufficient amount of coolant in the system
- Faulty thermostat (Section 3)
- Radiator core or grille blocked (Section 3)
- Faulty electric fan or thermal switch (Section 3)
- Inaccurate temperature sensor or panel indicator (Section 3)
- Air lock in the cooling system (Section 3)
- Expansion tank cap defective (Section 3)
Hypothermia
Coolant leaking out
- Damaged hoses or loose hose clamps
- Leaks in radiator or heater pipes (Section 3)
- Radiator cap damaged (Section 3)
- Destruction of the cuff of the water pump (Section 3)
- Gasket leak between water pump and cylinder block (Section 3)
- Boiling due to overheating (Section 3)
- Block plug leakage (Section 2)
Coolant leak inside (usually in the oil pan)
Corrosion
- Infrequent draining of fluid and flushing of the system
- Poor quality coolant or wrong type of coolant