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Engine Cooling System Flushing - With Oil or Transmission Fluid Contamination

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For information on Ford Color Coded Illustrations refer to OEM COLOR CODING .

Special Tool(s) / General Equipment 

Fluid Suction Gun
Hose Clamp Remover/Installer
Fluid Container

Flushing 

NOTE: Use this procedure only if the cooling system is contaminated with oil or transmission fluid. If the cooling system is contaminated with any material other than oil or transmission fluid, carry out the Cooling System Flushing - Without Oil or Transmission Fluid Contamination procedure.
NOTE: For the coolant flow diagram, refer to Engine Cooling - Component Location .
  1. With the vehicle in NEUTRAL, position it on a hoist. Refer to: Jacking and Lifting - Overview .
    • Fabricate a fresh water supply hose.

    • NOTE: The heater hose will prevent kinking in tight areas of the engine compartment.

      Cut the garden hose to length. The hose must reach from a fresh water supply faucet to the vehicle.

    • Using a coupling adapter and 2 hose clamps, attach a 61 cm (2 ft) length of heater hose to the garden hose.

    GFD462254Courtesy of FORD MOTOR COMPANY
    • Fabricate a drain hose.

    • NOTE: The heater hose will prevent kinking in tight areas of the engine compartment.

      Using a coupling adapter and 2 hose clamps, attach a 61 cm (2 ft) length of heater hose to the remaining article of the garden hose to be used as a drain hose.

    GFD462255Courtesy of FORD MOTOR COMPANY
  4. 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.

    Release the pressure in the cooling system by slowly turning the pressure relief cap one-half turn counterclockwise. When the pressure is released, remove the pressure relief cap.

    GFD462250Courtesy of FORD MOTOR COMPANY
  5. Using a suitable suction devise, siphon all contents and contaminants from the degas bottle. Use the General Equipment: Fluid Suction Gun
    GFD462256Courtesy of FORD MOTOR COMPANY
  6. Remove the pin-type retainers and position the lower air deflector aside.
    GFD462251Courtesy of FORD MOTOR COMPANY
  7. Connect a hose to drain the coolant. Open the radiator draincock and drain the engine coolant in a suitable, clean container. Use the General Equipment: Fluid Container
    GFD462257Courtesy of FORD MOTOR COMPANY
  8. Release the clamp and disconnect the lower radiator hose, and drain all the contaminants from the lower radiator hose. Use the General Equipment: Hose Clamp Remover/Installer Use the General Equipment: Fluid Container
    GFD462258Courtesy of FORD MOTOR COMPANY
  9. Remove the thermostat. Refer to: Thermostat .
  10. Remove the O-ring from the thermostat assembly and install the O-ring and the coolant outlet connection.

    Torque: 97 lb.in (11 Nm)

    GFD462259Courtesy of FORD MOTOR COMPANY
  11. NOTE: Do not install the fender splash shield at this time.

    Install the coolant inlet connector. Refer to: Coolant Inlet Connector .

  12. Depress the quick release tabs and disconnect the heater return hose.
    GFD462260Courtesy of FORD MOTOR COMPANY
  13. Using a coupling adapter and 2 hose clamps, connect the fabricated fresh water supply hose to the heater core.
  14. Using hose pinch pliers, clamp the upper radiator hose.
    GFD462261Courtesy of FORD MOTOR COMPANY
  15. Using hose pinch pliers, clamp the coolant bypass hose.
    GFD462262Courtesy of FORD MOTOR COMPANY
  16. Install the pressure relief cap.
    GFD462263Courtesy of FORD MOTOR COMPANY
  17. NOTE: Use of hot water during this procedure will improve removal of petroleum based cooling system contaminants.

    Turn on the fresh water supply and allow the water to flush the cylinder block of contaminants.

  18. Turn the water off when finished.
  19. Remove the hose pinch pliers from the upper radiator hose.
  20. Turn on the fresh water supply and allow the water to flush the radiator of contaminants.
  21. Turn the water off when finished.
  22. Remove the hose pinch pliers from the coolant bypass hose.
  23. Remove the pressure relief cap.
    GFD462250Courtesy of FORD MOTOR COMPANY
  24. Disconnect the fresh water supply hose from the heater core.
  25. Connect the heater return hose.
    GFD462260Courtesy of FORD MOTOR COMPANY
  26. Connect the lower radiator hose and position the clamp. Use the General Equipment: Hose Clamp Remover/Installer
    GFD462258Courtesy of FORD MOTOR COMPANY
  27. Depress the quick release tabs and disconnect the transmission cooler coolant tubes. Use the General Equipment: Hose Clamp Remover/Installer
    GFD462264Courtesy of FORD MOTOR COMPANY
    1. Using a coupling adapter and 2 hose clamps, connect the fabricated fresh water supply hose to the transmission cooler outlet fitting.
    2. Using a hose clamp, connect the fabricated drain hose to the transmission cooler inlet fitting.
    GFD462265Courtesy of FORD MOTOR COMPANY
  29. Turn on the fresh water supply and allow the water to flush the transmission cooler of contaminants.
  30. Turn the water off when finished.
  31. Disconnect the fresh water supply hose from the transmission cooler outlet fitting.
  32. Disconnect the drain hose from the transmission cooler inlet fitting.
  33. Connect the transmission cooler coolant tubes.
    GFD462264Courtesy of FORD MOTOR COMPANY
  34. Close the radiator draincock.
    GFD462050Courtesy of FORD MOTOR COMPANY
    • Release the clamp and disconnect the upper radiator hose. Use the General Equipment: Hose Clamp Remover/Installer

    • Add 1.89L (1/2 gal) of Simple Green® to the engine via the coolant outlet connection opening.

    • Connect the upper radiator hose and position the clamp. Use the General Equipment: Hose Clamp Remover/Installer

    GFD462266Courtesy of FORD MOTOR COMPANY
    1. Fill the cooling system with hot water:
    2. Fill the degas bottle to the maximum fill line.
    3. NOTE: The degas bottle cap must be loose so that the cooling system does not get pressurized.

      Install the degas bottle cap until it contacts the hard stop. Back the degas bottle cap off one-half turn.

    4. If the coolant level drops below the minimum fill line refill the degas bottle to the maximum fill line.
    5. Run the engine at 2, 000 rpm for 2 minutes.
    6. Bring the engine to an idle.
    7. If the coolant level drops below the minimum fill line refill the degas bottle to the maximum fill line.
    8. Repeat Steps 5 through 7 until the coolant level stabilizes. Shut the engine off.
    9. Fill the degas bottle to 20 mm (0.787 in) above the maximum fill line. Install the degas bottle cap.
  37. Select the maximum heater temperature and blower motor speed settings.
  38. Start the engine.
  39. Using a scan tool, select active command and set the cooling fan to ON.
  40. NOTE: Failure to run the engine at 2, 000 rpm for 1 hour will result in insufficient cleaning of the cooling system.

    Using a scan tool, select active command and set the engine rpm to 2, 000 and run the engine for 1 hour.

  41. Return the engine to idle speed, shut the engine off and allow the engine to cool.
  42. 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.

    Release the pressure in the cooling system by slowly turning the pressure relief cap one-half turn counterclockwise. When the pressure is released, remove the pressure relief cap.

    GFD462250Courtesy of FORD MOTOR COMPANY
  43. Using a suitable suction device, siphon all contents and contaminants from the degas bottle.
    GFD462256Courtesy of FORD MOTOR COMPANY
  44. Open the radiator draincock and drain the cooling system. Leave the radiator draincock open.
    GFD462257Courtesy of FORD MOTOR COMPANY
  45. Release the clamp and disconnect the lower radiator hose, and drain all the contaminants from the lower radiator hose. Use the General Equipment: Hose Clamp Remover/Installer
    GFD462258Courtesy of FORD MOTOR COMPANY
  46. Close the radiator draincock.
    GFD462050Courtesy of FORD MOTOR COMPANY
  47. Repeat steps 35 through 46 an additional 3 times.
    • Release the clamp and disconnect the upper radiator hose. Use the General Equipment: Hose Clamp Remover/Installer

    • Add 0.946L (1 qt) of Motorcraft® Engine Cooling System Iron Cleaner / VC-9 to the engine via the coolant outlet connection opening.

    • Connect the upper radiator hose and position the clamp. Use the General Equipment: Hose Clamp Remover/Installer

    GFD462266Courtesy of FORD MOTOR COMPANY
    1. Fill the cooling system with hot water:
    2. Fill the degas bottle to the maximum fill line.
    3. NOTE: The degas bottle cap must be loose so that the cooling system does not get pressurized.

      Install the degas bottle cap until it contacts the hard stop. Back the degas bottle cap off one-half turn.

    4. If the coolant level drops below the minimum fill line refill the degas bottle to the maximum fill line.
    5. Run the engine at 2, 000 rpm for 2 minutes.
    6. Bring the engine to an idle.
    7. If the coolant level drops below the minimum fill line refill the degas bottle to the maximum fill line.
    8. Repeat Steps 5 through 7 until the coolant level stabilizes. Shut the engine off.
    9. Fill the degas bottle to 20 mm (0.787 in) above the maximum fill line. Install the degas bottle cap.
  50. Select the maximum heater temperature and blower motor speed settings.
  51. Start the engine.
  52. Using a scan tool, select active command and set the cooling fan to ON.
  53. NOTE: Failure to run the engine at 2, 000 rpm for 1 hour will result in insufficient cleaning of the cooling system.

    Using a scan tool, select active command and set the engine rpm to 2, 000 and run the engine for 1 hour.

  54. Return the engine to idle speed, shut the engine off and allow the engine to cool.
  55. 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.

    Release the pressure in the cooling system by slowly turning the pressure relief cap one-half turn counterclockwise. When the pressure is released, remove the pressure relief cap.

    GFD462250Courtesy of FORD MOTOR COMPANY
  56. Using a suitable suction device, siphon all contents and contaminants from the degas bottle.
    GFD462256Courtesy of FORD MOTOR COMPANY
  57. Open the radiator draincock and drain the cooling system. Leave the radiator draincock open.
    GFD462257Courtesy of FORD MOTOR COMPANY
  58. Release the clamp and disconnect the lower radiator hose, and drain all the contaminants from the lower radiator hose. Use the General Equipment: Hose Clamp Remover/Installer
    GFD462258Courtesy of FORD MOTOR COMPANY
  59. Close the radiator draincock.
    GFD462050Courtesy of FORD MOTOR COMPANY
  60. Depress the quick release tabs and disconnect the heater return hose.
    GFD462260Courtesy of FORD MOTOR COMPANY
  61. Using a coupling adapter and 2 hose clamps, connect the fabricated fresh water supply hose to the heater core.
  62. Using hose pinch pliers, clamp the coolant bypass hose.
    GFD462262Courtesy of FORD MOTOR COMPANY
  63. Remove the degas bottle. Refer to: Degas Bottle .
  64. Clean the degas bottle in a solvent tank.
  65. Install the degas bottle. Refer to: Degas Bottle .
  66. Install the pressure relief cap.
    GFD462263Courtesy of FORD MOTOR COMPANY
  67. NOTE: Failure to flush all the Motorcraft® Engine Cooling System Iron Cleaner / VC-9 from the cooling system will result in shortened coolant protection against corrosion of the cooling system.

    Turn on the fresh water supply and allow the water to flush the heater core and radiator system until the drain water is free of foam, bubbles or discoloration.

  68. While the water is flushing the heater core and radiator system, use a clear, clean approximately 1 L (1 qt) container to collect some of the drain water and verify the drain water is free of foam, bubbles or discoloration.
  69. If the drain water in step 68 shows signs of foam, bubbles or discoloration, continue to flush the heater core and radiator system with fresh water and repeat step 68 until the drain water is free of foam, bubbles or discoloration.
  70. Turn off the fresh water supply.
  71. Open the radiator draincock and drain the cooling system. Use a clear, clean, approximately 1 L (1 qt) container to verify the drain water is free of foam, bubbles or discoloration. Use the General Equipment: Fluid Container
    GFD462257Courtesy of FORD MOTOR COMPANY
  72. Close the radiator draincock.
    GFD462050Courtesy of FORD MOTOR COMPANY
  73. If any of the drain water in step 71 shows signs of foam, bubbles or discoloration, repeat steps 67 through 71.
  74. Using hose pinch pliers, clamp the upper radiator hose.
    GFD462261Courtesy of FORD MOTOR COMPANY
  75. Turn on the fresh water supply and allow the water to flush the cylinder block until the water is free of foam, bubbles or discoloration.
  76. While the water is flushing the engine, use a clear, clean approximately 1 L (1 qt) container to collect some of the drain water and verify the drain water is free of foam, bubbles or discoloration.
  77. If the drain water in step 76 shows signs of foam, bubbles or discoloration, continue to flush the engine with fresh water and repeat step 76 until the drain water is free of foam, bubbles or discoloration.
  78. Turn off the fresh water supply and allow the cylinder block to drain.
  79. Disconnect the fresh water supply from the heater core.
  80. Connect the heater return hose.
    GFD462260Courtesy of FORD MOTOR COMPANY
  81. Connect the lower radiator hose and position the clamp. Use the General Equipment: Hose Clamp Remover/Installer
    GFD462258Courtesy of FORD MOTOR COMPANY
  82. Depress the quick release tabs and disconnect the transmission cooler coolant tubes. Use the General Equipment: Hose Clamp Remover/Installer
    GFD462264Courtesy of FORD MOTOR COMPANY
    1. Using a coupling adapter and 2 hose clamps, connect the fabricated fresh water supply hose to the transmission cooler outlet fitting.
    2. Using a hose clamp, connect the fabricated drain hose to the transmission cooler inlet fitting.
    GFD462265Courtesy of FORD MOTOR COMPANY
  84. Turn on the fresh water supply and allow the water to flush the transmission cooler until the drain water is free of foam, bubbles or discoloration.
  85. While the water is flushing the transmission cooler, use a clear, clean approximately 1 L (1 qt) container to collect some of the drain water and verify the drain water is free of foam, bubbles or discoloration.
  86. If the drain water in step 85 shows signs of foam, bubbles or discoloration, continue to flush the transmission cooler with fresh water and repeat step 85 until the drain water is free of foam, bubbles or discoloration.
  87. Turn off the fresh water supply.
  88. Disconnect the fresh water supply hose from the transmission cooler outlet fitting.
  89. Disconnect the drain hose from the transmission cooler inlet fitting.
  90. Connect the transmission cooler coolant tubes.
    GFD462264Courtesy of FORD MOTOR COMPANY
    1. Fill the cooling system with low hardness, low chloride water. Tap water which is verified with Rotunda Water Test Strip 5 pack 328-00007 or equivalent is acceptable. Alternatively, use water treated by reverse osmosis, or water that is de-ionized or distilled.
    2. Fill the degas bottle to the maximum fill line.
    3. NOTE: The degas bottle cap must be loose so that the cooling system does not get pressurized.

      Install the degas bottle cap until it contacts the hard stop. Back the degas bottle cap off one-half turn.

    4. If the coolant level drops below the minimum fill line refill the degas bottle to the maximum fill line.
    5. Run the engine at 2, 000 rpm for 2 minutes.
    6. Bring the engine to an idle.
    7. If the coolant level drops below the minimum fill line refill the degas bottle to the maximum fill line.
    8. Repeat Steps 5 through 7 until the coolant level stabilizes. Shut the engine off.
    9. Fill the degas bottle to 20 mm (0.787 in) above the maximum fill line. Install the degas bottle cap.
  92. 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.

    Release the pressure in the cooling system by slowly turning the pressure relief cap one-half turn counterclockwise. When the pressure is released, remove the pressure relief cap.

    GFD462250Courtesy of FORD MOTOR COMPANY
  93. Open the radiator draincock and drain the cooling system. Leave the radiator draincock open.
    GFD462257Courtesy of FORD MOTOR COMPANY
    • Release the clamp and disconnect the lower radiator hose, and drain all the water from the lower radiator hose. Use the General Equipment: Hose Clamp Remover/Installer

    • Connect the lower radiator hose and position the clamp when finished. Use the General Equipment: Hose Clamp Remover/Installer

    GFD462258Courtesy of FORD MOTOR COMPANY
  95. Close the radiator draincock.
    GFD462050Courtesy of FORD MOTOR COMPANY
  96. Position back the lower air deflector and install pin-type retainers.
    GFD462251Courtesy of FORD MOTOR COMPANY
  97. Using a new thermostat O-ring, install the thermostat. Refer to: Thermostat .
  98. Install the RH fender rear splash shield. Refer to: Fender Splash Shield .
  99. Install the RH front tire. Refer to: Wheel and Tire .
  100. Fill and bleed the cooling system. Refer to: Engine Cooling System Draining, Vacuum Filling and Bleeding .
  101. Install a new degas bottle cap until it contacts the hard stop.
GFD462263Courtesy of FORD MOTOR COMPANY
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