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Home >> Lincoln >> 2019 >> MKZ Base, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 4 (Engine Cooling - 3.0L ECOBOOST) >> Diagnosis And Testing >> Engine Cooling >> Pinpoint Tests >> Pinpoint Test A : Loss Of Coolant >> Pinpoint Test A : Loss Of Coolant

Pinpoint Test A : Loss Of Coolant

WARNING: This page is about a different variant/trim than selected.
  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

    Are any concerns present? 

    Yes  REPAIR as needed.
    No  GO to  A2

  3. A2 CHECK THE ENGINE COOLANT LEVEL AND PRESSURE TEST THE ENGINE COOLING SYSTEM

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

    • Ignition OFF

    • Visually inspect the engine coolant level at the degas bottle and adjust as necessary. Pressure test the engine cooling system. Refer to Cooling System Pressure Test  .

    Does the engine cooling system leak externally? 

    Yes  REPAIR or INSTALL new components.
    No  GO to  A3

  4. A3 CHECK THE ENGINE COOLANT FOR AN INTERNAL LEAK

    • Inspect the engine coolant in the degas bottle for signs of engine oil.

    Is engine oil evident in the engine coolant? 

    Yes  REFER to: Engine .
    No  GO to  A4

  5. A4 CHECK THE ENGINE OIL FOR COOLANT

    • Remove the oil level indicator from the engine.

    Is coolant evident in the oil? 

    Yes  REFER to: Engine .
    No  GO to  A5

  6. A5 CHECK THE ENGINE COOLANT FOR TRANSMISSION FLUID

    • Check the engine coolant in the degas bottle for signs of transmission fluid.

    Is transmission fluid evident in the engine coolant? 

    Yes  INSTALL a new Transmission Fluid Warmer. REFER to: Transmission Fluid Warmer . REPAIR the transmission as necessary. REFER to: Automatic Transmission - 3.0L EcoBoost . TEST the system for normal operation.
    No  GO to  A6

  7. A6 CHECK THE TRANSMISSION FLUID FOR ENGINE COOLANT

    • Remove the transmission oil leveling plug.

    • Check the transmission fluid for engine coolant.

    Is engine coolant evident in the transmission fluid? 

    Yes  INSTALL a new Transmission Fluid Warmer. REFER to: Transmission Fluid Warmer . REPAIR the transmission as necessary. REFER to: Automatic Transmission - 3.0L EcoBoost . TEST the system for normal operation.
    No  GO to  A7

  8. A7 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  REFER to: Engine .
    No  The cooling system is operational.
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