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Pinpoint Test B: The Engine Overheats

WARNING: This page is about a different car, the 2004 Mercury Monterey and 2004 Ford Freestar. However, it is still accessible from the selected car via links, so may be relevant.
  1. B1 CHECK THE ENGINE COOLANT LEVEL 
    NOTE: If the engine is hot, allow the engine to cool before proceeding.
    • Key in OFF position.
      • WARNING: Never remove the pressure relief cap while the engine is operating or when the cooling system is hot. Failure to follow these instructions can result in damage to the cooling system or engine or personal injury. To avoid having scalding hot coolant or steam blow out of the degas bottle when removing the pressure relief cap, wait until the engine has cooled, then wrap a thick cloth around the pressure relief cap and turn it slowly. Step back while the pressure is released from the cooling system. When you are sure all the pressure has been released, turn and remove the pressure relief cap (still with a cloth).
    • Check the engine coolant level at the degas bottle.
    • Is the engine coolant OK? 

    Yes 

    GO to B2

    No 

    REFILL the engine coolant at the degas bottle. Go To PINPOINT TEST A: LOSS OF COOLANT 

  2. B2 CHECK THE COOLANT CONDITION 
    • Check the coolant for contaminants such as rust, corrosion, or discoloration.
    • Is the coolant condition OK? 

    Yes 

    GO to B3

    No 

    FLUSH the engine cooling system. TEST the system for normal operation

  3. B3 CHECK FOR AN AIRFLOW OBSTRUCTION 
    • Inspect the A/C condenser core and radiator for obstructions such as leaves or dirt.
    • Is there an obstruction? 

    Yes 

    REMOVE the obstruction. CLEAN the A/C condenser core and radiator. TEST the system for normal operation.

    No 

    GO to B4

  4. B4 CHECK THE THERMOSTAT OPERATION 
    • Key in START position.
    • Start the engine and allow it to run until the engine reaches operating temperature.
    • Feel the inlet and outlet heater water hoses and the underside of the upper radiator hose.
    • Are the upper radiator hose and the heater hoses cold? 

    Yes 

    INSTALL a new thermostat. TEST the system for normal operation.

    No 

    GO to B5

  5. B5 CHECK THE COOLING FAN OPERATION 
    • Using the diagnostic tool, command the cooling fans ON in low, medium and high speed.
    • Do the cooling fans operate correctly? 

    Yes 

    INSTALL a new coolant pump. TEST the system for normal operation.

    No 

    GO to SYMPTOM CHART  to diagnose cooling fans.

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