Transmission Fluid Cooler - Backflushing and Cleaning

NOTE: The cooler bypass valve cannot be backflushed. When backflushing the transmission fluid cooler the cooler bypass valve must be removed from the transmission cooling system prior to backflushing and cleaning.

1. NOTE: Use transmission fluid specified for this transmission. Do not use any supplemental transmission fluid additives or cleaning agents. The use of these products could cause internal transmission components to fail, which will affect the operation of the transmission.

   Transmission fluid cooler backflushing will be carried out using the Transmission Heated Cooler Line Flusher. Follow the manufacturer's instructions included with the machine. Test the equipment to make sure that a vigorous fluid flow is present before proceeding.
   Check and top off fluid level of the cooler line flusher with transmission fluid.
   General Equipment : Transmission Cooling System Heated Flusher
   Material : Motorcraft® MERCON® LV Automatic Transmission Fluid / XT-10-QLVC (WSS-M2C938-A) (MERCON® LV )

1. Allow the fluid in the cooler line flusher 15-30 minutes to heat up to 60°C (140°F) before using.
   

1. Disconnect the transmission fluid cooler tubes from the transmission fluid cooler.
   

1. Install the line adapters on the transmission fluid cooler inlet and outlet tubes.
   

1. Attach the cooler line flusher red line to the transmission fluid cooler inlet tube assembly. For the location of the transmission fluid cooler inlet and outlet tubes.
   Refer to: Transmission Cooling (307-02B Transmission Cooling - Vehicles With: 6-Speed Automatic Transmission - 6F35, Description and Operation).
   

1. Attach the cooler line flusher blue line to the transmission fluid cooler outlet tube assembly.
   

1. Follow the equipment instructions to purge the transmission fluid cooler tubes and transmission fluid cooler prior to starting the flushing procedure.
   

1. Allow the transmission fluid cooling system to backflush for 10-15 minutes, then flush the transmission fluid cooler in a normal flow direction for an additional 10-15 minutes.
   

1. Clean the transmission mounted fluid cooler tubes and replace the thermal bypass valve.
   Refer to: Cooler Bypass Valve (307-02B Transmission Cooling - Vehicles With: 6-Speed Automatic Transmission - 6F35, Removal and Installation).
   

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