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Overheating Cause Analysis NBLC0029 Symptom Check items Cooling sys- Poor heat transfer Water pump malfunction Worn or loose drive belt — Thermostat stuck closed — Damaged fins Dust contamination or Mechanical damage Clogged radiator cooling Excess foreign material Reduced air flow Cooling fan does not oper- — — High resistance to fan rota- Damaged fan blades Damaged radiator shroud — — — Improper coolant mixture — — — Poor coolant quality — — — Insufficient coolant Coolant leaks Cooling hose Loose clamp Cracked hose Water pump Poor sealing Radiator cap Loose Poor sealing Radiator O-ring for damage, dete- Cracked radiator tank Cracked radiator core Reservoir tank Cracked reservoir tank Overflowing reservoir tank Exhaust gas leaks into Cylinder head deteriora- Cylinder head gasket ENGINE COOLING SYSTEM Overheating Cause Analysis LC-24 |