Mountaineer 2WD V6-4.0L VIN K (2007)
Fluid - A/T: Service and Repair
Transmission Fluid Cooler - Backflushing and Cleaning
Transmission Fluid Cooler - Backflushing and Cleaning
Material
CAUTION: Whenever a transmission has been disassembled to install new parts or a new or remanufactured transmission has been
installed, a new transmission fluid cooler, either in-tank, auxiliary or oil to air (OTA), if equipped will need to be installed. Using a suitable
torque converter/fluid cooler cleaner, clean and backflush the transmission fluid cooler tubes.
CAUTION: Do not use water-based cleaners, mineral spirits, brake cleaner or solvents that may contain acetone, xylene or heptane to clean
and/or flush the transmission assembly, transmission components and the torque converter or transmission damage will occur. Use only clean
transmission fluid designated for the transmission/converter being serviced.
When internal wear or damage has occurred in the transmission, metal particles, clutch plate material or band material may have been carried into the
transmission fluid cooler. These contaminants are a major cause of recurring transmission concerns and must be removed from the system before the
transmission is put back in use.
1. Conduct backflushing with a suitable torque converter/transmission fluid cooler cleaner. Test the equipment to make sure that a vigorous fluid
flow is present before proceeding. Install a new system filter if flow is weak or contaminated.
2. Remove and discard the in-line transmission fluid filter, if equipped.
3. To aid in attaching the cleaner to the transmission steel cooler lines, connect 2 additional rubber hoses to the transmission end of the steel
transmission cooler lines as described.
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Connect the cleaner tank pressure line to the steel transmission cooler return line (longest line).
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Connect a tank return hose to the steel transmission cooler pressure line (shorter line). Place the outlet end of this hose in the solvent tank
reservoir.
4. Turn on the pump and allow the transmission fluid to circulate a minimum of 5 minutes (cycling switch on and off will help dislodge
contaminants in the cooler system).
5. Switch off the pump and disconnect the pressure hose from the transmission cooler return line.
6. Use compressed air to blow out the cooler(s) and lines (blow air into the transmission cooler return line) until all the fluid is removed.
7. Remove the rubber return hose from the remaining steel cooler line.
