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CO-4 < SYMPTOM DIAGNOSIS > OVERHEATING CAUSE ANALYSIS SYMPTOM DIAGNOSIS OVERHEATING CAUSE ANALYSIS Troubleshooting Chart INFOID:0000000009950390 Symptom Check items Cooling sys- Poor heat transfer Water pump malfunction Worn or loose drive belt — Thermostat and water con- — Damaged fins Dust contamination or pa- Physical damage Clogged radiator cooling Excess foreign material Reduced air flow Cooling fan does not oper- Fan assembly — High resistance to fan rota- Damaged fan blades Damaged radiator shroud — — — Improper engine coolant — — — Poor engine coolant quality — Engine coolant viscosity — Insufficient engine coolant Engine coolant leakage Cooling hose Loose clamp Cracked hose Water pump Poor sealing Radiator cap Loose Poor sealing Radiator O-ring for damage, deterio- Cracked radiator tank Cracked radiator core Reservoir tank Cracked reservoir tank Overflowing reservoir tank Exhaust gas leakage into Cylinder head deterioration Cylinder head gasket deteri- |