Cooling System

Overheating

    - Insufficient coolant in system
    - Thermostat faulty
    - Radiator core blocked, or grille restricted
    - Cooling fan or viscous coupling faulty
    - Inaccurate temperature gauge sender unit
    - Airlock in cooling system
    - Pressure cap faulty

Overcooling

    - Thermostat faulty
    - Inaccurate temperature gauge sender unit
    - Viscous coupling faulty

External coolant leakage

    - Deteriorated or damaged hoses or hose clips
    - Radiator core or heater matrix leaking
    - Pressure cap faulty
    - Cooling pump internal seal leaking
    - Cooling pump-to-block seal leaking
    - Boiling due to overheating
    - Core plug leaking

Internal coolant leakage

    - Leaking cylinder head gasket
    - Cracked cylinder head or cylinder block

Corrosion

    - Infrequent draining and flushing
    - Incorrect coolant mixture or inappropriate coolant type
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