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OVERHEATING CAUSE ANALYSIS CO-9 < FUNCTION DIAGNOSIS > [QR25DE] C D E F G H I J K L M A CO N P O OVERHEATING CAUSE ANALYSIS Troubleshooting Chart INFOID:0000000004205442 Symptom Check items Cooling sys- Poor heat transfer Water pump malfunction Worn or loose drive belt — Thermostat stuck closed Coolant circulation Damaged fins Dust contamination or rock Mechanical damage Clogged radiator cooling Excess foreign material Reduced air flow Cooling fan does not oper- Engine cooling fans — High resistance to fan rota- Damaged fan blades Damaged radiator shroud — Radiator shroud— — Improper coolant mixture — Coolant viscosity — Poor coolant quality — Periodic maintenance — Insufficient coolant Coolant leaks 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 leaks into cool- Cylinder head deterioration Cylinder head gasket deteri- |