- Carburetor mixture is too lean
- Ignition timing is retarded or too advance
- Radiator tubes blocked
- Restricted air flow through radiator
- Missing or damaged radiator shroud
- Water jackets in engine block clogged with rust
- Head gasket leaking exhaust into cooling system
- Burnt valves
- Valves need adjusting
- Cracks in cylinder head
- Radiator fins not attached to tube
- Coolant leaks from hoses, gaskets or water pump
- Incorrect radiator cap fitted
- Defective radiator cap – will not hold pressure
- Thermostat stuck
- Water pump impeller slipping
- Water pump impeller worn or broken
- Excessive antifreeze in coolant mixture
- Fan belt loose or slipping
- Low coolant level
- Incorrect thermostat fitted
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