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Pinpoint Test A: Loss Of Coolant

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. A1 

    CHECK THE ENGINE COOLANT LEVEL

    NOTE: Allow the engine to cool before checking the engine coolant level.
    • Key in OFF position.
    • Visually check the engine coolant level at the degas bottle.
    • Is the engine coolant level within specification? 
    • Yes  : GO to  A2.
    • No  : FILL the engine coolant as necessary. GO to  A6.
  2. A2 CHECK THE DEGAS BOTTLE PRESSURE RELIEF CAP 
    WARNING: To avoid personal injury, do not unscrew the coolant pressure relief cap while the engine is operating or hot. The cooling system is under pressure; steam and hot liquid can come out forcefully when the cap is loosened slightly.
    • Inspect the pressure relief cap for foreign material between the sealing gasket and the diaphragm.
    • Is the pressure relief cap OK? 
    • Yes  : GO to  A5.
    • No  : CLEAN or INSTALL a new pressure relief cap. TEST the system for normal operation. GO to  A3.
  3. A3 CHECK THE ENGINE COOLANT FOR INTERNAL LEAK 
    WARNING: To avoid personal injury, do not unscrew the coolant pressure relief cap while the engine is operating or hot. The cooling system is under pressure; steam and hot liquid can come out forcefully when the cap is loosened slightly.
    • Key in OFF position.
    • Inspect the engine coolant in the degas bottle for signs of engine oil.
    • Is oil evident in the coolant? 
  4. A4 CHECK THE ENGINE OIL FOR COOLANT 
    • Remove the oil level indicator from the engine.
    • Is coolant evident in the oil? 
  5. A5 PRESSURE TEST THE ENGINE COOLING SYSTEM 
    • Pressure test the engine cooling system. Refer to the COMPONENT TESTS  .
    • Does the engine cooling system leak? 
    • Yes  : REPAIR or INSTALL new components. TEST the system for normal operation.
    • No  : The cooling system is operational. GO to SYMPTOM CHART .
  6. A6 CHECK THE DEGAS BOTTLE 
      WARNING: To avoid personal injury, do not unscrew the coolant pressure relief cap while the engine is operating or hot. The cooling system is under pressure; steam and hot liquid can come out forcefully when the cap is loosened slightly.
      NOTE: The engine must be cool when coolant is added to the degas bottle.
    • Add coolant to the degas bottle until fluid is between the coolant fill level marks.
    • Does the degas bottle leak? 
    • Yes  : INSTALL a new degas bottle. Refer to DEGAS BOTTLE  . TEST the system for normal operation.
    • No  : CARRY OUT the cooling system pressure test. Refer to the COMPONENT TESTS  . REPAIR as necessary. TEST the system for normal operation.
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