- Not enough coolant in the system (Section 1)
- Thermostat is faulty (Section 3)
- The radiator core is clogged (Section 3)
- The cooling fan or the thermal viscous coupling is faulty (Section 3)
- The expansion tank cap is damaged (Section 3)
- Incorrectly adjusted ignition timing/damage to 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
- Hoses or their fastening clamps are worn or damaged (Section 1)
- The radiator core or heater matrix is leaking (Section 3)
- The expansion tank cap is damaged (Section 3)
- Water pump seal is leaking (Section 3)
- Boiling due to overheating (Section 3)
- The core plug is leaking (Section 2A)
Internal coolant leak
- The cylinder head gasket is leaking (Section 2A or 2B)
- Cracked cylinder head or cylinder block (Section 2A or 2B)
Corrosion
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