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Pinpoint Test C: The Engine Does Not Reach Normal Operating Temperature

WARNING: This page is about a different car, the 2006 Mercury Grand Marquis and 2006 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
WARNING: Never remove the pressure relief cap under any conditions while the engine is operating or hot. Failure to follow these instructions could result in personal injury or damage to the cooling system or engine. To avoid having scalding hot coolant or steam blow out of the cooling system, use extreme care when removing the pressure relief cap. Wait until the engine has cooled, then wrap a thick cloth around the pressure relief cap and turn it slowly. Step back while the pressure is released from the cooling system. When you are certain all the pressure has been released, (with a cloth) turn and remove the pressure relief cap. Failure to follow these instructions may result in serious personal injury.
  1. C1 CARRY OUT INSPECTION AND VERIFICATION 

    Yes  : REPAIR as needed. TEST the system for normal operation.

    No  : GO to C2.

  2. C2 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCs) P0125 or P0128 
    NOTE: REFER to the INTRODUCTION - GASOLINE article for correct scan tool hook-up procedure.
    • Check for DTCs P0125 or P0128.
    • Is DTC P0125 or P0128 present? 

    Yes  : If the vehicle is equipped with an electric cooling fan, GO to C3. If the vehicle is equipped with only a mechanical cooling fan, GO to  C4.

    No  : The cooling system is operational. If an inoperative engine coolant temperature gauge is suspected, CHECK the engine coolant temperature gauge operation. REFER to INSTRUMENT CLUSTER . If an inoperative climate control system is suspected, CHECK the climate control system operation. REFER to CLIMATE CONTROL SYSTEM-GENERAL INFORMATION & DIAGNOSIS . If any other DTCs are retrieved, REFER to the INTRODUCTION - GASOLINE article.

  3. C3 CHECK THE ELECTRIC COOLING FAN OPERATION 
    • Allow the engine to cool.
    • Make sure the A/C switch is OFF (if equipped).
    • Start the engine.
    • Check the electric cooling fan.
    • Is the electric cooling fan on all the time? 

    Yes  : DIAGNOSE the electric cooling fan operation. Refer to the INTRODUCTION - GASOLINE article.

    No  : If the vehicle is also equipped with a mechanical cooling fan, GO to C4. Otherwise, GO to  C5.

  4. C4 CHECK THE MECHANICAL COOLING FAN OPERATION 
    • Carry out the cooling fan clutch component tests. For a mechanical cooling fan clutch, refer to COMPONENT TESTS . For an electronic cooling fan clutch, REFER to the INTRODUCTION - GASOLINE article.
    • Is the cooling fan clutch OK? 

    Yes  : GO to C5.

    No  : INSTALL a new cooling fan clutch. TEST the system for normal operation.

  5. C5 CHECK THE COOLANT LEVEL 
      NOTE: Allow the engine to cool before checking the coolant level.
    • Visually check the engine coolant level in the degas bottle or coolant expansion tank.
    • Is the engine coolant level within specification? 

    Yes  : INSTALL a new thermostat. TEST the system for normal operation.

    No  : GO to PINPOINT TEST A  to diagnose a coolant leak.

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