Circuit/System Testing
- Test the thermostat for correct operation. Refer to THERMOSTAT DIAGNOSIS .
- Test the engine cooling system for overheating. Refer to ENGINE OVERHEATING .
- Inspect the water pump and coolant flow for correct operation. Refer to WATER PUMP CLEANING AND INSPECTION .
- Inspect the engine mechanical for worn/leaking/cracked cylinder heads or engine block. Refer to COOLANT IN COMBUSTION CHAMBER and COOLANT IN ENGINE OIL .