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Transmission Fluid Cooler Leaks at Radiator

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Transmission fluid may leak between the radiator transmission fluid cooler and the transmission fluid cooler fitting (not the transmission fluid cooler tube into the transmission fluid cooler fitting), which may result in a residue of transmission fluid on the radiator tank around the fluid cooler fitting. Insufficient thread sealer on the transmission fluid cooler fitting may cause this.

Fig 1: Locating Transmission Fluid Cooler Fitting Bolts
G06778466Courtesy of FORD MOTOR CO.
  1. Clean the area around the transmission fluid cooler fittings.
  2. Verify that transmission fluid is leaking between the transmission fluid cooler and the transmission fluid cooler fitting (not the transmission fluid cooler tube fitting into the transmission fluid cooler fitting).
    Fig 2: Identifying Transmission Fluid Cooler Fitting
    G06778467Courtesy of FORD MOTOR CO.
  3. Remove the radiator from the vehicle and place it on a flat surface with the transmission fluid cooler fittings facing upward. Refer to ENGINE COOLING - GASOLINE ENGINES .
  4. NOTE: Oil-based solvents and cleaners should not be used when cleaning the radiator. Oil-based solvents and cleaners can damage the radiator end tank seals and cause leaks.

    Clean the area around the transmission fluid cooler fittings so that contaminants do not enter the transmission fluid cooler when the transmission fluid cooler fittings are removed.

    Fig 3: Locating Transmission Fluid Cooler Fitting Bolt
    G06778468Courtesy of FORD MOTOR CO.
  5. NOTE: Remove only one transmission fluid cooler fitting at a time, otherwise the transmission fluid cooler may drop into the radiator.

    Remove the upper transmission fluid cooler fitting.

  6. Once the transmission fluid cooler fitting is removed from the transmission fluid cooler, verify that there is a gasket between the transmission fluid cooler and the inside of the radiator tank.
    • If there is no gasket, install a new radiator.
    • If there is a gasket, continue with this procedure.
      Fig 4: Locating Transmission Fluid Cooler Fitting Threads
      G06778469Courtesy of FORD MOTOR CO.
  7. Inspect the transmission fluid cooler fitting threads for damage.
    • If the transmission fluid cooler fitting threads are damaged, install a new radiator.
    • If the transmission fluid cooler fitting threads show no sign of damage, continue with this procedure.
      Fig 5: Locating Transmission Fluid Cooler Fitting Thread Damages
      G06778470Courtesy of FORD MOTOR CO.
  8. NOTE: Thread sealant or tape should never be used on the threads of the transmission fluid cooler fittings. The use of such materials will create a leak path.

    Install a new O-ring on the transmission fluid cooler fitting.

    Fig 6: Locating Transmission Fluid Cooler Fitting O-Ring
    G06778471Courtesy of FORD MOTOR CO.
  9. Making sure that the gasket between the transmission fluid cooler and the inside of the radiator tank is still in place, install the upper transmission fluid cooler fitting.
    • Tighten to 60 Nm (44 lb-ft).
      Fig 7: Locating Upper Transmission Fluid Cooler Fitting
      G06778472Courtesy of FORD MOTOR CO.
  10. NOTE: Remove only one transmission fluid cooler fitting at a time, otherwise the cooler may drop into the radiator.

    Remove the lower transmission fluid cooler fitting.

  11. Once the transmission fluid cooler fitting is removed from the transmission fluid cooler, verify that there is a gasket between the transmission fluid cooler and the inside of the radiator tank.
    • If there is no gasket, install a new radiator.
    • If there is a gasket, continue with this procedure.
      Fig 8: Locating Transmission Fluid Cooler Fitting Threads
      G06778469Courtesy of FORD MOTOR CO.
  12. Inspect the transmission fluid cooler fitting threads for damage.
    • If the transmission fluid cooler fitting threads are damaged, install a new radiator.
    • If the transmission fluid cooler fitting threads show no sign of damage, continue with this procedure.
      Fig 9: Locating Transmission Fluid Cooler Fitting Thread Damages
      G06778470Courtesy of FORD MOTOR CO.
  13. NOTE: Thread sealant or tape should never be used on the threads of the transmission fluid cooler fittings. The use of such materials will create a leak path.

    Install a new O-ring on the transmission fluid cooler fitting.

    Fig 10: Locating Transmission Fluid Cooler Fitting O-Ring
    G06778475Courtesy of FORD MOTOR CO.
  14. Making sure that the gasket between the transmission fluid cooler and the inside of the radiator tank is still in place, install the lower transmission fluid cooler fittings.
    • Tighten to 60 Nm (44 lb-ft).
  15. Make sure that no engine coolant has entered the transmission fluid cooler. Install the radiator in the vehicle. Refer to ENGINE COOLING - GASOLINE ENGINES .
  16. Verify that both the transmission and the engine cooling system fluids are at the correct levels.
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