6. Cooling system
120
Failure Diagnosis
Phenomenon Causes Troubleshooting
Overheated engine
Not enough coolant Replenish the coolant
Defective radiator cap Replace it
Contaminated radiator Clean the exterior of the radiator
Defective V-belt offset Adjust or replace it
Contaminated or damaged V-belt Replace it
Damaged impeller Replace the coolant pump
Defective impeller fix Replace the coolant pump
Bad coolant pump operation Replace it
Bad water temperature controller operation Replace it
Bad coolant flow Clean the coolant path
Improper injection time
Check it with the failure diagnosis
unit
Damaged cylinder head gasket Replace it
Overcooled engine
Bad water temperature controller operation Replace it
Too low ambient temperature Heat the block
Leaking coolant
Damaged radiator Repair or replace it
Loosened or damaged radiator connection Repair or replace the connection
Defective radiator cap Replace it
Badly mounted coolant pump Repair or replace it
Bad or damaged coolant pump gasket Replace the gasket
Badly mounted water temperature controller Repair or replace it
Bad or damaged water temperature controller
gasket
Replace the gasket
Damaged cylinder head gasket Replace the gasket
Damaged cylinder head or block Replace it
Noise
Bad coolant pump bearing Replace the bearing
Bad or damaged cooling fan Repair or replace it
Bad rotation of the cooling fan Replace it
Defective V-belt offset Adjust or replace it
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