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Pinpoint Test B: THE ENGINE OVERHEATS

WARNING: This page is about a different car, the 2005 Lincoln LS. 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 under any conditions while the engine is operating. Failure to follow these instructions can result in damage to the cooling system or engine and/or personal injury. To avoid having scalding hot coolant or steam blow out of the cooling system, use extreme care when removing the pressure relief cap from a hot degas bottle. Wait until the engine has cooled, then wrap a thick cloth around the pressure relief cap and turn it slowly one turn (counterclockwise). Step back while the pressure is released from the cooling system. When certain all the pressure has been released, remove the pressure relief cap (still with a cloth).
    • Key in OFF position.
    • Check the engine coolant level at the degas bottle.
    • Is the engine coolant OK? 
    • Yes  : GO to  B2.
    • No  : FILL the engine coolant at the degas bottle. GO to PINPOINT TEST A .
  2. B2 CHECK THE COOLANT CONDITION 
    • Check the coolant for contaminants such as rust, corrosion, or discoloration.
    • Is the coolant condition OK? 
  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 the engine to run for 10 minutes.

    • Key in OFF position.
    • Feel the upper and lower radiator hoses.
    • Are the upper and lower radiator hoses cold? 
  5. B5 CHECK THE COOLING FAN OPERATION 
    • Carry out the cooling fan diagnostic tests. See INTRODUCTION - GASOLINE to diagnose the cooling fan system.
    • Is the cooling fan operation OK? 
    • Yes  : GO to  B6.
    • No  : REPAIR the cooling fan system. See INTRODUCTION - GASOLINE . TEST the system for normal operation.
  6. B6 CHECK COOLANT PUMP OPERATION 
    • Visually inspect coolant pump for rotation and damage.
    • Is coolant pump OK? 
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