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Pinpoint Test A: Loss Of Coolant

WARNING: This page is about a different car, the 2004 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE: Allow the engine to cool before checking the engine coolant level.
  1. A1 CHECK 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? 
      1. Yes  : GO to A2.
      2. 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? 
      1. Yes  : GO to  A5.
      2. No: CLEAN or INSTALL a new pressure relief cap. TEST the system for normal operation. GO to A3. 
    3. 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.
  3. A3 CHECK THE ENGINE COOLANT FOR INTERNAL LEAK 
    • Key in OFF position.
    • Inspect the engine coolant in the degas bottle for signs of engine oil.
    • Is oil evident in the coolant? 
      1. Yes  : If engine oil is evident, REFER to ENGINE SYSTEM-GENERAL INFORMATION .
      2. No  : GO to A4.
  4. A4 CHECK THE ENGINE OIL FOR COOLANT 
    • Remove the oil level indicator from the engine.
    • Is coolant evident in the oil? 
      1. Yes  : If coolant is in the engine, REFER to ENGINE SYSTEM-GENERAL INFORMATION .
      2. No  : GO to A5.
  5. A5 PRESSURE TEST THE ENGINE COOLING SYSTEM 
    • Pressure test the engine cooling system. Refer to the COMPONENT TESTS  in this section.
    • Does the engine cooling system leak? 
      1. Yes  : REPAIR or INSTALL new components. TEST the system for normal operation.
      2. No  : The cooling system is operational. GO to SYMPTOM CHART .
    6. 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.
  6. A6 CHECK THE DEGAS BOTTLE 
    • Add coolant to the degas bottle until fluid is between the coolant fill level marks.
    • Does the degas bottle leak? 
      1. Yes  : INSTALL a new degas bottle. TEST the system for normal operation.
      2. No  : CARRY OUT the cooling system pressure test. REFER to the COMPONENT TESTS  in this section. REPAIR as necessary. TEST the system for normal operation.
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