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Pinpoint Test A : Loss Of Coolant

WARNING: This page is about a different car, the 2017 Lincoln Navigator and 2017 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.
  1. WARNING: Always allow the engine to cool before opening the cooling system. Do not unscrew the coolant pressure relief cap when the engine is operating or the cooling system is hot. The cooling system is under pressure; steam and hot liquid can come out forcefully when the cap is loosened slightly. Failure to follow these instructions may result in serious personal injury.

  2. A1 CARRY OUT INSPECTION AND VERIFICATION

    • Carry out the inspection and verification procedure in this article.

    Were any concerns found? 

    Yes  REPAIR as needed.
    No  GO to  A2.

  3. A2 CHECK THE ENGINE COOLANT LEVEL

    NOTE: Allow the engine to cool before checking the engine coolant level.

    • Ignition OFF.
    • Visually inspect the engine coolant level at the coolant expansion tank.

    Is the engine coolant level within specifications? 

    Yes  GO to  A3.
    No  ADJUST the engine coolant level as necessary. GO to  A3.

  4. A3 PRESSURE TEST THE ENGINE COOLING SYSTEM

    Does the engine cooling system leak externally? 

    Yes  REPAIR or INSTALL new components.
    No  GO to  A4.

  5. A4 CHECK THE ENGINE COOLANT FOR AN INTERNAL LEAK

    • Inspect the engine coolant in the coolant expansion tank and the radiator for signs of engine oil or transmission fluid.

    Is engine oil or transmission fluid evident in the coolant? 

    Yes  If engine oil is evident, GO to Engine System General Information for engine diagnosis. If transmission fluid is evident, INSTALL a new radiator. REPAIR the transmission as necessary. Refer to the appropriate Automatic Transmission article for the procedure.
    No  GO to  A5.

  6. A5 CHECK THE ENGINE OIL AND TRANSMISSION FLUID FOR COOLANT

    • Remove the oil level indicators from the engine and the transmission.

    Is coolant evident in the oil or transmission fluid? 

    Yes  If coolant is in the engine oil, GO to Engine System General Information . If coolant is in the transmission fluid, INSTALL a new radiator. REPAIR the transmission as necessary. Refer to the appropriate Automatic Transmission article for the procedure.
    No  GO to  A6.

  7. A6 CHECK THE COOLING SYSTEM FOR COMBUSTION GASES

    • NOTE: Use UView ® Combustion Leak Tester part number UVU560000-R or equivalent.

      Using a cooling system combustion gas leak tester, following the instructions supplied with the tester, check the coolant for combustion gases.

    Are combustion gases present? 

    Yes  GO to Engine System General Information for engine diagnosis.
    No  The cooling system is operational.
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