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COOLING SYSTEM FAULT DIAGNOSIS SYMPTOM POSSIBLE CAUSE CURE A-EXTERNAL LEAKAGE 1.Loose hose clips 1.Tighten 2Defective rubber hose 2.Renew 3. Damaged radiator seams 3. Rectify 4. Excessive wear in the water pump 4. Renew 5. Loose core plugs 5. Renew 6. Damaged gaskets 6. Renew 7. Leaks at the heater connections 7. Rectify or plugs at the water temperature 8. Tighten gauge plug 1. Defective cylinder head gasket 2. Cracked cylinder wall 1. Boiling 2. Internal or external leakage B-INTERNAL LEAKAGE 1. Renew. Check engine oil for contamination and refill as necessary oil contamination and refill as necessary 1. Ascertain the cause of engine overheating and correct as necessary 1. See item D 2. Refill C-WATER LOSS F-OVERHEATING 1. Poor circulation 2. Dirty oil and sludge in engine 4. Check using electronic equipment 5. Insufficient coolant 5. See item D 6. Low oil level 6. Replenish 7. Tight engine 7. New engines are very tight and moderate 1,000 miles 8. Choked or damaged exhaust pipe 8. Rectify or renew silencer 9. Adjust brakes 10. Overloading vehicle 10. ln the hands of the operator 11. Driving in heavy sand or mud 12. Engine labouring on gradients 13. Low gear work 16. Defective thermostat 16. Renew 11. In the hands of the operator In the hands of the operator 13.ln the hands of the operator In the hands of the operator 15. lnaccurate temperature gauge 15. Renew I D -P O O R CIRCULATION 1. Restriction in system 1. Check hoses for crimps, reverse-flush the 2. lnsufficient coolant 2. Replenish I 3. lnoperative water pump 3. Renew 4. Loose fan belt 4. Adjust 5. Inoperative thermostat 5.Renew radiator, and clear the system of rust and sludge |