Insufficient coolant in system - Thermostat faulty - Radiator blocked or grille restricted - Electrical cooling fan faulty - Temperature gauge sender unit faulty - Air locked cooling system - Pressure cap faulty.
Overcooling
Faulty Thermostat - Temperature gauge sender unit faulty.
Coolant leakage
Damaged hoses or hose clips - Radiator core leaking - Pressure cap faulty - Water pump seals leaking - Boiling due to overheating - Core plug leaking - Cylinder head gasket leak - Cracked cylinder head or cylinder block.
Corrosion
Infrequent draining and flushing - Incorrect anti-freeze mixture or wrong type.
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