Transmission Fluid Cooler - Backflushing and Cleaning

For information on Ford Color Coded Illustrations refer to OEM Color Coding .

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.

   The transmission cooling system (cooler and lines) MUST be flushed every time the transmission is overhauled or replaced in order to minimize the likelihood of repeat repairs. It is mandatory that proper equipment and procedures be followed when flushing coolers/lines. The flushing equipment used MUST:

   • maintain fluid at 140°F or above,
   • pulsate fluid during cleaning,
   • have a GPM flow meter,
   • have twin magnetic filters,
   • and have air purge capability before and after flushing.

2. If equipment meeting the specifications above is not available, the transmission fluid coolers should be replaced and the lines cleaned by hand.
3. 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.
   NOTE: 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 the fluid level of the transmission cooling system heated flusher with transmission fluid. Transmission Cooling System Heated Flusher Automatic Transmission Fluid (WSS-M2C938-A;MERCON® LV)

4. Turn on the heater and allow the fluid in the transmission cooling system heated flusher 15-30 minutes to heat up to 60°C (140°F) before using.
5. Disconnect the transmission fluid cooler tubes from the cooler bypass valve.
6. Install the line adapters on the transmission fluid cooler inlet and outlet tubes.
7. 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, For additional information, refer to: Transmission Cooling - Component Location .
8. Attach the cooler line flusher blue line to the transmission fluid cooler outlet tube assembly.
9. Follow the Transmission Cooling System Heated Flusher manufacturer's instructions to purge the transmission fluid cooler tubes and the transmission fluid cooler prior to starting the flushing procedure.
10. Allow the Transmission Cooling System Heated Flusher to backflush for 10-15 minutes, then flush the transmission fluid cooler in a normal flow direction for an additional 10-15 minutes.
11. If the transmission fluid cooling system heated flusher is equipped with an inspection micron filter:
    1. Remove and clean the Oberg 28 micron filter.
    2. Install the filter.
    3. Backflush the system for 5 minutes.
    4. Remove and inspect the filter.
    5. If debris/contamination is present on the filter, repeat step 10.

12. 11. Follow the equipment instructions to purge the transmission fluid cooler tubes and transmission fluid cooler.
13. 12. Disconnect the transmission mounted fluid cooler tubes from the cooler bypass valve.
14. Clean the transmission mounted fluid cooler tubes and install a new cooler bypass valve. For additional information, refer to: Cooler Bypass Valve .