Overheat
- Not enough coolant in the system
- Thermostat defective
- Clogged radiator core
- Faulty cooling fan or thermoviscous coupling
- Temperature sensor/indicator gives incorrect readings
- Air lock in the cooling system
- Expansion tank cap damaged
Hypothermia
- Thermostat defective
- Temperature sensor/indicator gives incorrect readings
- Faulty thermoviscous coupling
External coolant leak
- Worn or damaged hoses or hose clamps
- Radiator core or heater matrix leaking
- Expansion tank cap damaged
- Coolant pump internal seal leaking
- Leaking gasket between coolant pump and cylinder block
- Boiling due to overheating
- Coolant jacket leaking
Internal coolant leak
- Cylinder head gasket leaking
- Split cylinder head or cylinder block
Corrosion
- Infrequent fluid changes and system flushes
- Wrong proportion of coolant mixture or wrong type of coolant
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