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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