| TUCSON(LM) >2010 > G 2.4 DOHC > Engine Mechanical System > Cooling System > Thermostat>Troubleshooting |

Troubleshooting
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 blowed-out)
• | Thermogauge indicates 'LOW'
| Visually check eyes observation after removing the radiator cap. |
• | Insufficient coolant or leakage.
• | After refilling coolant, recheck.
GDS check & Starting engine |
• | Check DTCs
• | 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.
• | 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 |
• | Engine overheated
• | Thermogauge indicates 'HI'
| Naked eyes observation 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 DTCs
• | 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.