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Pinpoint Test B: The Engine Overheats

WARNING: This page is about a different car, the 2010 Mercury Milan, 2010 Lincoln MKZ, and 2010 Ford Fusion. 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. B1 CARRY OUT INSPECTION AND VERIFICATION 
    • Carry out the Inspection and Verification procedure in this section.
    • Were any concerns found? 
  1. B2 CHECK FOR DTCs 
    NOTE: Refer to INTRODUCTION - GASOLINE MODELS and/or INTRODUCTION - HYBRID for correct scan tool hook-up procedure.
    • Check for DTC P0217, P1285 or P1299.
    • Is DTC P0217, P1285 or P1299 present? 
  1. B3 CHECK FOR AN AIRFLOW OBSTRUCTION 
    • Check the radiator or A/C condenser for an external obstruction such as leaves or cardboard.
    • Is an obstruction present? 
  1. B4 CHECK THE ENGINE COOLANT LEVEL 
    NOTE: Allow the engine to cool before checking the coolant level.
    • Ignition OFF.
    • Visually check the engine coolant level in the degas bottle.
    • Is the engine coolant level within specification? 
  1. B5 PRESSURE TEST THE ENGINE COOLING SYSTEM 
  1. B6 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 coolant? 
  1. B7 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? 
  1. B8 CHECK THE COOLING SYSTEM FOR COMBUSTION GASES 
    NOTE: Use U-View® Combustion Leak Tester, part No. 560000 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? 
  1. B9 CHECK COOLANT CONDITION 
    • Check the coolant for dirt, rust or contamination and check the coolant concentration.
    • Is the coolant condition OK? 
  1. B10 CHECK THE ELECTRIC COOLING FAN OPERATION 
    • Start the engine.
    • Place the climate control function selector in the MAX A/C position and the blower motor switch in the HI position.
    • Did the electric cooling fan operate? 
  1. B11 CHECK THE COOLANT PUMP OPERATION 
    • Start the engine.
    • Allow the engine to run for 30 minutes. Place the climate control function selector in the MAX HEAT position. Feel the heater outlet hose.
    • Is the heater outlet hose hot? 
  1. B12 CHECK THE THERMOSTAT OPERATION 
    • Start the engine.
    • Allow the engine to run for 30 minutes. Feel the lower radiator hose.
    • Is the lower radiator hose hot? 
  1. B13 CHECK THE ENGINE VENT HOSE CHECK VALVE 
    • Disconnect the engine vent hose from the engine and degas bottle.
    • Using a light, look inside the end of the vent hose that connects to the engine. A check valve should be installed 50 mm (1.96 in) from the end of the hose.
    • Using regulated compressed air, confirm air flows freely from the engine end to the degas bottle end.
    • Using regulated compressed air, confirm air does not flow from the degas bottle end to the engine end.
    • Is the check valve installed in the vent hose and does air flow through in one direction and not the other? 
  1. B14 VISUALLY INSPECT THE THERMOSTAT 
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