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