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Home >> Ford >> 2012 >> Explorer Base, 3.5 8, AWD, 6F50 >> Repair and Diagnosis >> External Pages >> Different car >> Section 98 (Secondary Engine Cooling System (Diesel)) >> Diagnosis And Testing >> Powertrain Secondary Cooling System >> Symptom Chart

Symptom Chart

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SYMPTOM CHART

Condition Possible Sources Action
  • Loss of coolant
  • Coolant hoses or tubes
  • Quick connect couplings
  • Hose clamps
  • Coolant pump O-ring seal or gasket
  • Thermostat O-ring seal or gasket
  • Radiator
  • Transmission fluid cooler (may leak internally or externally)
  • Degas bottle
  • Pressure relief cap
  • Coolant pump leaking from weep hole
  • EGR cooler (may leak internally or externally)
  • Fuel cooler (may leak internally or externally)
  • CAC (may lead internally or externally)
  • The system overheats
  • Low coolant level
  • External coolant leak
  • Airlock in system
  • Pressure relief cap installation
  • Restricted airflow through the A/C condenser or radiator
  • Internal coolant leak
  • Coolant condition/concentration
  • Radiator
  • Thermostat
  • Coolant pump
  • The engine does not reach normal operating temperature
  • Low coolant level
  • Thermostat