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Home >> Lincoln >> 2005 >> Aviator RWD >> Repair and Diagnosis >> Engine Mechanical >> Cooling System (Mechanical) >> Engine Cooling >> Diagnosis And Testing >> Engine Cooling >> Symptom Chart

Symptom Chart

SYMPTOM CHART

Condition Possible Sources Action
  • Loss of engine coolant
  • Radiator.
  • Coolant pump seal.
  • Radiator hoses.
  • Heater hoses.
  • Heater core.
  • Engine gaskets.
  • Degas bottle.
  • Heater control valve.
  • Thermostat housing.
  • The engine overheats
  • Coolant thermostat.
  • Coolant pump.
  • Airlock in system.
  • Inoperative electric cooling fan.
  • Internal engine coolant leak.
  • Radiator.
  • Radiator airflow obstruction.
  • Fan/fan clutch.
  • Heater core.
  • Pressure relief cap.
  • Airlock in the system.
  • Coolant condition/concentration.
  • The engine does not reach normal operating temperature
  • Thermostat.
  • The block heater does not operate correctly
  • Block heater power cable.
  • CHECK continuity in all three power cable circuits. If any circuit tests over 5 ohms, INSTALL a new power cable.
  • Block heater.
  • The electric cooling fan is inoperative
  • Circuitry.
  • Relay.
  • Cooling fan motor.
  • The electric cooling fan stays on all the time
  • Circuitry.
  • Fan relay.
  • A/C system fault.
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