Hyundai Sonata: Thermostat. Troubleshooting - Cooling System - Engine Mechanical System - Hyundai Sonata YF 2011-2019 Service ManualHyundai 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:

    Body Control Module (BCM). Specifications
    Specifications Items Specifications Rated voltage DC 12V Operating voltage DC 9 ~ 16V Operating temp ...

    Closing the fuel filler lid
    1. To install the cap, turn it clockwise until it “click” one time. This indicates that the cap is securely tightened. 2. Close the fuel filler lid and push it in lightly making sure that it is sec ...

    Description and Operation
    Function Of Safety Power Window When driver door power window auto-up switch is operated, safety function is activated. 1. Safety function condition When detect ...