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Home >> Mercury >> 2010 >> Milan Base, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1252 (Engine Cooling System - (Except Hybrid)) >> Diagnosis And Testing >> Engine Cooling >> Pinpoint Tests >> Pinpoint Test C: The Engine Does Not Reach Normal Operating Temperature >> Pinpoint Test C: The Engine Does Not Reach Normal Operating Temperature

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

WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
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.
  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 DTC P0125 or P0128 
    NOTE: Refer to the INTRODUCTION - GASOLINE MODELS for correct scan tool hook-up procedure.
    • Check for DTC P0125 or P0128.
    • Is DTC P0125 or P0128 present? 
    • Yes:  GO to C3  .
    • No:  The cooling system is operational. If an inoperative engine coolant temperature gauge is suspected, CHECK the engine coolant temperature gauge operation. REFER to DIAGNOSIS AND TESTING . If an inoperative climate control system is suspected, CHECK the climate control system operation. Refer to the appropriate CLIMATE CONTROL SYSTEM for the procedure. If any other DTCs are retrieved, REFER to the INTRODUCTION - GASOLINE MODELS .
  3. C3 CHECK THE ELECTRIC COOLING FAN OPERATION 
    • Allow the engine to cool.
    • Make sure the A/C switch is OFF.
    • Start the engine.
    • Check the electric cooling fan.
    • Is the electric cooling fan on all the time? 
  4. C4 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.
    • 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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