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Pinpoint Test B: The Engine Overheats

WARNING: This page is about a different car, the 2005 Ford RV Cutaway, 2005 Ford Econoline, 2005 Ford E450 Super Duty, and 2005 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
  1. B1 CHECK THE ENGINE COOLANT LEVEL 
    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).
    NOTE: If the engine is hot, allow the engine to cool before proceeding.
    • Key in OFF position.
    • Make sure the engine is cool.
    • Wrap a thick cloth around the coolant pressure relief cap on the degas bottle. Slowly turn the cap counterclockwise (left) until the pressure begins to release.
    • Step back while the pressure releases.
    • When you are sure all the pressure has been released, use the cloth to turn and remove the cap.
    • 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 .
  2. B2 CHECK THE COOLANT CONDITION 
    • Check the coolant for rust, dirt or contamination.
    • Is the coolant condition OK? 
    • Yes  : GO to B3.
    • No  : FLUSH the engine cooling system; REFER to COOLING SYSTEM FLUSHING . 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  B5.
  4. B4 CHECK THE THERMOSTAT OPERATION 
    • Start the engine and allow the engine to run for ten minutes.
    • Feel the inlet and outlet heater hoses and the underside of the upper radiator hose.
    • Are the upper radiator hose and the heater water hoses cold? 
    • Yes  : INSTALL a new thermostat. TEST the system for normal operation.
    • No  : GO to B5.
  5. B5 CHECK THE COOLING FAN OPERATION 
    • Yes  : GO to ENGINE SYSTEM-GENERAL INFORMATION or Diagnosis and Testing of the engine.
    • No  : INSTALL a new fan component determined to be faulty. TEST the system for normal operation.
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