Hyundai Elantra: Troubleshooting - Cooling System - Engine Mechanical System - Hyundai Elantra HD 2006–2010 Service ManualHyundai Elantra: Troubleshooting

Troubleshooting

Water Pump
Symptoms
Possible Causes
Remedy
Coolant leakage
•
From the bleed hole of the water pump
Visually check
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Check leaks after about ten-minute warming up.
•
If coolant still leaks, replace a water pump.
•
If leakage stops, reuse the water pump (Do not replace the pump with a new one).
•
From gaskets or bolts
•
Check the tightening of the water pump mounting bolts.
•
Retighten the mounting bolts.
•
Check damage of gaskets or inflow of dust.
•
Replace the gasket and clean dust off.
•
From outer surface of water pump
•
Check the material or any cracks of the water pump.
•
Poor material. If any crack found, replace the water pump.
Noise
•
From bearings
•
From mechanical seals
•
Impeller interference
Inspection with a stethoscope
•
After starting the engine, check noise with a stethoscope.
•
If there is no noise, reuse the water pump (do not replace it).
•
If there is any noise from the water pump, remove the drive belt and recheck.
Inspection after removing a drive belt
•
After removing a water pump and a drive belt, check noise again.
•
If there is noise, reuse the water pump. Check other drive line parts.
•
If there is no noise, replace the water pump with a new one.
Inspection after removing a water pump
•
After removing a water pump and a drive belt, check noise again.
•
If there is any interference between them, replace the water pump with a new one.
Overheating
•
Damaged impeller
•
Loosened impeller
Loosened impeller
•
Corrosion of the impeller wing
•
Check engine coolant.
•
Poor coolant quality / Maintenance check
•
Impeller seperation from the shaft
•
Replace the water pump.

Thermostat
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 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'
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.