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Home >> Ford >> 2000 >> Taurus LX, 3.0 2, AX4N >> Repair and Diagnosis >> External Pages >> Different car >> Section 1527 (Engine Cooling System - (Except Hybrid)) >> Diagnosis And Testing >> Engine Cooling >> Pinpoint Tests >> Pinpoint Test B: The Engine Overheats >> Pinpoint Test B: The Engine Overheats

Pinpoint Test B: The Engine Overheats

WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
WARNING: Always allow the engine to cool before opening the cooling system. Do not unscrew the coolant pressure relief cap when the engine is operating or the cooling system is hot. The cooling system is under pressure; steam and hot liquid can come out forcefully when the cap is loosened slightly. Failure to follow these instructions may result in serious personal injury.
  1. B1 CARRY OUT INSPECTION AND VERIFICATION 
    • Yes:  REPAIR as needed. TEST the system for normal operation.
    • No:  GO to B2  .
  2. B2 CHECK FOR DTCs 
      NOTE: Refer to the INTRODUCTION - GASOLINE MODELS for correct scan tool hook-up procedure.
    • Check for DTCs P0217, P1285 and P1299.
    • Is DTC P0217, P1285 or P1299 present? 
  3. B3 CHECK FOR AN AIRFLOW OBSTRUCTION 
    • Check the radiator or A/C condenser for an obstruction such as leaves or cardboard.
    • Is an obstruction present? 
    • Yes:  REMOVE the obstruction. TEST the system for normal operation.
    • No:  GO to B4  .
  4. B4 CHECK THE ENGINE COOLANT LEVEL 
    NOTE: Allow the engine to cool before checking the coolant level.
    • Ignition OFF.
    • Visually check the engine coolant level in the degas bottle.
    • Is the engine coolant level within specification? 
    • Yes:  GO to B5  .
    • No:  ADJUST the engine coolant level as necessary. GO to B5  .
  5. B5 PRESSURE TEST THE ENGINE COOLING SYSTEM 
    • Yes:  REPAIR or INSTALL new components. TEST the system for normal operation.
    • No:  GO to B6  .
  6. B6 CHECK THE ENGINE COOLANT FOR AN INTERNAL LEAK 
    • Inspect the engine coolant in the degas bottle for signs of engine oil.
    • Is engine oil evident in the coolant? 
  7. B7 CHECK THE ENGINE OIL FOR COOLANT 
    • Remove the oil level indicator from the engine.
    • Is coolant evident in the oil? 
    • Yes:  If coolant is in the engine oil, GO to DIAGNOSIS AND TESTING for engine diagnosis.
    • No:  GO to B8  .
  8. B8 CHECK THE COOLING SYSTEM FOR COMBUSTION GASES 
      NOTE: Use U-View® Combustion Leak Tester part number 560000 or equivalent.
    • Using a cooling system combustion gas leak tester, following the instructions supplied with the tester, check the coolant for combustion gases.
    • Are combustion gases present? 
  9. B9 CHECK COOLANT CONDITION 
    • Check the coolant for dirt, rust or contamination and check the coolant concentration.
    • Is the coolant condition OK? 
    • Yes:  GO to B10  .
    • No:  FLUSH the engine cooling system. REFER to COOLING SYSTEM FLUSHING . TEST the system for normal operation.
  10. B10 CHECK THE ELECTRIC COOLING FAN OPERATION 
    • Start the engine.
    • Place the climate control function selector in the MAX A/C position and the blower motor switch in the HI position.
    • Did the electric cooling fan operate? 
  11. B11 CHECK THE COOLANT PUMP OPERATION 
    • Start the engine.
    • Allow the engine to run for 30 minutes. Place the climate control function selector in the MAX HEAT position. Feel the heater outlet hose.
    • Is the heater outlet hose hot? 
    • Yes:  GO to B12  .
    • No:  INSTALL a new coolant pump. TEST the system for normal operation.
  12. B12 CHECK THE THERMOSTAT OPERATION 
    • Start the engine.
    • Allow the engine to run for 30 minutes. Feel the lower radiator hose.
    • Is the lower radiator hose hot? 
    • Yes:  CHECK the engine coolant temperature gauge operation. REFER to DIAGNOSIS AND TESTING .
    • No:  GO to B13  .
  13. B13 VISUALLY INSPECT THE THERMOSTAT 
    • Yes:  INSTALL a new thermostat. TEST the system for normal operation.
    • No:  INSTALL a new thermostat. TEST the system for normal operation. If the engine still overheats, INSTALL a new radiator. TEST the system for normal operation.
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