Symptoms
|
Possible Causes
|
Remedy
|
Coolant leakage
|
•
|
From the thermostat gasket
|
|
Check the mounting bolts
|
•
|
Check the torque of the mounting bolts
|
|
•
|
Retighten the bolts and check leakage again.
|
|
Check the gasket for damage
|
•
|
Check gasket or seal for damage
|
|
•
|
Replace gaskets and reuse the thermostat.
|
|
Cooled excessively
|
•
|
Low heater performance (cool air blows-out)
|
•
|
Thermogauge indicates 'LOW'
|
|
Visually check after removing the radiator cap.
|
•
|
Insufficient coolant or leakage.
|
|
•
|
After refilling coolant, recheck.
|
|
GDS check&Starting engine
|
•
|
Check the fan motor performance as temperature
varies.
|
•
|
Check connection of the fan clutch or the
fan motor.
|
※ If the fan clutch is always connected, there will be
a noise at idle.
|
•
|
Check the engine coolant sensor, wiring and
connectors.
|
•
|
Check the fan motor, the relay and the connector.
|
•
|
Replace the componants.
|
|
Remove the thermostat and inspect
|
•
|
Check if there are dusts or chips in the
thermostat valve.
|
•
|
Check adherence of the thermostat.
|
|
•
|
Clean the thermostat valve and reuse the
thermostat.
|
•
|
Replace the thermostat, if it doesn't work
properly.
|
|
Heated excessively
|
•
|
Thermogauge indicates 'HI'
|
|
Visually check after removing the radiator cap.
|
•
|
Insufficient coolant or leakage.
※ Be careful when removing a radiator cap
of the overheated vehicle.
|
•
|
Check air in cooling system.
|
|
•
|
After refilling coolant, recheck.
|
•
|
Check the cylinder head gaskets for damage
and the tightening torque of the mounting bolts.
|
|
GDS check&Starting engine
|
•
|
Check the fan motor performance as temperature
varies.
|
•
|
Check if the fan clutch slips.
|
•
|
Check the water pump adherence or impeller
damaged.
|
|
•
|
Check the engine coolant sensor, wiring and
connectors.
|
•
|
Check the fan motor, the relay and the connector.
|
•
|
Replace the fan clutch, if it doesn't work
properly.
|
•
|
Replace the water pump, if it doesn't work
properly.
|
|
Immerse the thermostat in boiling water and inspection.
|
•
|
After removing the thermostat, check it works
properly.
|
※ Check the thermostat opens at the valve opening temperature.
|
•
|
Replace the thermostat, if it doesn't work
properly.
|
|
See also:
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