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Home >> Ford >> 2018 >> Taurus Limited, FWD, Gas >> Repair and Diagnosis >> External Pages >> Different car >> Section 52 (Engine Cooling - 2.0L DURATEC-He (129KW/175PS)) >> Diagnosis And Testing >> Engine Cooling >> Diagnostic Routine(s) >> Pinpoint Test A : Loss Of Coolant

Pinpoint Test A : Loss Of Coolant

WARNING: This page is about a different car, the 2018 Ford EcoSport. However, it is still accessible from the selected car via links, so may be relevant.
  1. Normal Operation and Fault Conditions 

    The engine cooling system is a closed system providing for coolant expansion and contraction as well as changes in pressure as coolant warms and cools with engine operation. Various gaskets, seals, hoses and clamps contain coolant within the cooling system and keep other fluids and contaminants from entering the cooling system.

    Possible Sources 

    • Coolant hoses or tubes
    • Hose clamps
    • Thermostat housing
    • Thermostat housing O-ring seals
    • Coolant pump gasket
    • Radiator
    • Pressure relief cap
    • Coolant pump
    • Oil cooler (may leak internally or externally) (if equipped)
    • Heater core
    • Engine gaskets (may leak internally or externally)
    • Degas bottle
    • ECT sensor
    • Cylinder block core plugs
    • Cylinder head core plugs
    • Block heater (if equipped)

  2. WARNING: 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.

  3. A1 CARRY OUT INSPECTION AND VERIFICATION

    • Carry out Inspection and Verification.

    Are any concerns present? 

    Yes  REPAIR as needed.
    No  GO to  A2

  4. 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 Component Tests  in this service information.

    Does the engine cooling system leak externally? 

    Yes  REPAIR or INSTALL new components.
    No  GO to  A3

  5. A3 CHECK THE ENGINE COOLANT FOR AN INTERNAL LEAK

    • Inspect the engine coolant in the coolant expansion tank for signs of engine oil.

    Is engine oil evident in the coolant? 

    Yes  Refer to: Engine .
    No  GO to  A4

  6. 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

  7. A5 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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