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Home >> Subaru >> 2021 >> Outback Base >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 4 (Engine Cooling System (2.4L)) >> Symptoms And Causes >> Inspection

Symptoms And Causes: Inspection

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Symptoms Problem parts etc. Possible cause
Over-heating Insufficient engine coolant Engine coolant leaks
Engine coolant passage Clogged engine coolant passage
Radiator cap Damage or deterioration of radiator cap
Thermostat Thermostat stuck
Water pump Damage of water pump
Damage of V-belt or defective V-belt tensioner
Radiator Clogged radiator fin
Radiator fan system Radiator fan system malfunction
Exhaust pipe Excessive back pressure in exhaust pipe
Cylinder block or cylinder head gasket etc. Engine oil leaking into engine coolant passage
Over cooling - Ambient temperature extremely low
Thermostat Stuck or damaged thermostat
Engine coolant leaks Thermostat cover Thermostat cover damaged
Gasket deterioration
Water pump Damage of water pump
Gasket deterioration
Water hose Water hose damaged or deteriorated
Water hose connection loose
Water pipe Water pipe damaged
O-ring deterioration
Radiator Radiator damaged
Radiator drain plug O-ring deterioration
Damage or deterioration of radiator cap
Heater core Heater core damaged
Cylinder head or cylinder block Cylinder head or cylinder block damaged
Cylinder head or cylinder block warpage
Cylinder head gasket Cylinder head gasket deterioration
Noise Air mixed in the engine coolant passage Insufficient air bleeding
Water pump Worn or damaged bearing
Radiator fan Deformation, cracks or other damage of radiator fan
Radiator fan motor Wear or damage inside the motor