Hyundai Sonata: Thermostat. Troubleshooting - Cooling System - Engine Mechanical SystemHyundai Sonata: 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 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 DTCs
•
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
•
Engine overheated
•
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 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.


    Thermostat. Repair procedures
    Removal and Installation Disassembly of the thermostat would have an adverse effect, causing a lowering of cooling efficiency. ...

    See also:

    Engine number
    2.4 engine 2.0 engine The engine number is stamped on the engine block as shown in the drawing. ...

    Mic. Repair procedures
    Inspection 1. Disconnect the negative(-) battery terminal. 2. Remove the roof trim. (Refer to the BD group - "Roof trim") ...

    Heated Oxygen Sensor (HO2S). Specifications
    Specification HO2S [Bank 1/Sensor 1] Item Specification Heater Resistance (Ω) 2.5 ~ 4.0 [20°C(68°F)] HO2S [Bank 1/Sensor 2 ...