- Not enough coolant in the system (Section 1)
- Thermostat defective (Section 3)
- Clogged radiator core (Section 3)
- Faulty cooling fan or thermoviscous coupling (Section 3)
- Expansion tank cap damaged (Section 3)
- Incorrectly adjusted ignition timing / damage in the ignition system (Section 1 and Section 5)
- Temperature sensor/indicator gives incorrect readings (Section 3)
- Air lock in the cooling system (Section 1)
hypothermia
External coolant leak
- Worn or damaged hoses or hose clamps (Section 1)
- Radiator core or heater matrix leaking (Section 3)
- Expansion tank cap damaged (Section 3)
- Leaking water pump seal (Section 3)
- Boiling due to overheating (Section 3)
- Core plug leaking (Section 2A)
Internal coolant leak
- Cylinder head gasket leaking (Chapter 2A or 2B)
- Split cylinder head or cylinder block (Chapter 2A or 2B)
Corrosion
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