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Pinpoint Test B: The Engine Overheats

WARNING: This page is about a different car, the 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
  1. B1 CHECK THE ENGINE COOLANT LEVEL 
    NOTE: If the engine is hot, allow the engine to cool before proceeding.
    • Key in OFF position.
      • WARNING: To avoid personal injury, do not unscrew the coolant pressure relief cap while the engine is operating or hot. The cooling system is under pressure; steam and hot liquid can release forcefully when the cap is loosened slightly.
    • Allow the engine to cool.
    • Check the engine coolant level at the degas bottle.
    • Is the engine coolant OK? 
    • Yes  : GO to B2.
    • No  : ADJUST the engine coolant at the degas bottle. GO to PINPOINT TEST A .
  2. B2 CHECK THE COOLANT CONDITION 
    • Check the coolant for contaminants such as rust, corrosion or discoloration.
    • Is the coolant condition OK? 
    • Yes  : GO to B3.
    • No  : FLUSH the engine cooling system. TEST the system for normal operation.
  3. B3 CHECK FOR AN AIRFLOW OBSTRUCTION 
    • Inspect the A/C condenser core, auxiliary transmission oil cooler, radiator and the charge air cooler, if equipped, for obstructions such as leaves or dirt.
    • Is there an obstruction? 
    • Yes  : REMOVE the obstruction. CLEAN the A/C condenser core and radiator. TEST the system for normal operation.
    • No  : GO to B4.
  4. B4 CHECK THE COOLANT THERMOSTAT OPERATION 
    • Key in START position.
      • NOTE: If the engine is a diesel, drive for 20 minutes in 2nd gear to open the thermostat.
    • For a gas engine, start the engine and allow the engine to run for 10 minutes.
    • Feel the inlet heater hose and the underside of the upper radiator hose.
    • Are the upper radiator hose and the inlet heater hoses cold? 
    • Yes  : INSTALL a new coolant thermostat. TEST the system for normal operation.
    • No  : GO to B5.
  5. B5 CHECK THE COOLING FAN OPERATION 
    • Key in OFF position.
    • Carry out the cooling fan component tests. Refer to FAN CLUTCH TEST .
    • Is the cooling fan operation OK? 
    • Yes  : REFER to ENGINE SYSTEM-GENERAL INFORMATION for diagnosis and testing of the engine.
    • No  : INSTALL new fan components as necessary. TEST the system for normal operation.
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