Transmission Fluid Cooler - Back-Flushing and Cleaning. General Procedures

Special Service Tools / General Equipment

Heated Transmission Cooling System

Materials

Flushing

NOTICE: If the plastic transmission cooler partition has melted due to overheating, install a new cooler. The plastic cannot be cleaned from the cooler, even with the cooler flushing system heated.

1. 1
   The transmission cooling system (radiator and lines) MUST be flushed every time a transmission overhaul or replacement is performed to minimize the chance of a repeat repair. It is essential that proper equipment and procedures are followed when flushing the coolers/lines. The flushing equipment used MUST:
   

   • maintain fluid temperature at 140 °F (60 °C) or higher,

   • pulse the fluid during cleaning,

   • have a GPM flow meter,

   • have dual magnetic filters,

   • and be capable of air purging before and after flushing.
2. 2
   If equipment meeting the above specifications is not available, replace the transmission fluid cooler(s) and clean the lines manually.
3. 3
   Check and top up the transmission fluid level in the heated transmission cooling system flushing device.
   Use general equipment: Transmission cooling system heated flushing tube
   Material: Motorcraft® MERCON® LV Automatic Transmission Fluid / XT-10-QLVC (WSS-M2C938-A) (MERCON® LV)
4. 4
   Turn on the heater and let the fluid in the cooler flusher circulate through the lines for 15-30 minutes to heat it to 60 °C before use.
5. 5
   If equipped with a cooler bypass valve, disconnect the transmission fluid cooler lines from the cooler bypass valve before backflushing and cleaning.
6. 6
   Install the line adapters on the transmission fluid cooler tubes.
7. 7
   Connect the red cooler line flushing line to the transmission fluid cooler assembly inlet fitting. Refer to the transmission fluid cooler inlet and outlet fitting locations.
8. 8
   Connect the blue cooler flush line to the transmission fluid cooler outlet tube assembly.
9. 9
   Follow the equipment instructions to clean the transmission fluid cooler tubes and transmission fluid cooler before starting the flushing procedure.
10. 10
    Allow the transmission cooling system to backflush for 10-15 minutes, then flush the transmission fluid cooler in the normal flow direction for another 10-15 minutes.
11. 11
    If the heated transmission cooling system flush machine is equipped with a control micron filter:
    

    1. Remove and clean the 28-micron Oberg filter.

    2. Install the filter.

    3. Flush the system for 5 minutes.

    4. Remove and inspect the filter.

    5. If debris/contamination is present on the filter, repeat step 10.
12. 12
    If equipped, remove the fluid cooler lines mounted on the transmission from the transmission.
13. 13
    Clean the fluid cooler lines mounted on the transmission.
14. 14
    If equipped, remove and discard the cooler bypass valve. Install a new cooler bypass valve.
    Refer to: Cooler Bypass Valve - 1.5 L EcoBoost (110 kW/150 L PS) - I4 (307-02A Transmission Cooling - 6-Speed Automatic Transmission - 6F35, Removal and Installation).
    Refer to: Cooler Bypass Valve - 2 L EcoBoost (184 kW/250 L PS) - I4 (307-02A Transmission Cooling - 6-Speed Automatic Transmission - 6F35, Removal and Installation).
    Refer to: Cooler Bypass Valve - 2.5 L Duratec (125 kW/170 L PS) (307-02A Transmission Cooling - 6-Speed Automatic Transmission - 6F35, Removal and Installation).