F 150 4WD V8-5.4L Flex Fuel (2008)
Transmission Cooler: Procedures
Transmission Fluid Cooler Backflushing and Cleaning
1. CAUTION: Do not use any supplemental transmission fluid additives or cleaning agents. The use of these products could cause internal
transmission components to fail; this will effect the operation of the transmission.
Conduct backflushing with a suitable torque converter/fluid cooler cleaner. Test your equipment to make sure that a vigorous fluid flow is present
before proceeding. Install a new filter in the flush equipment if flow is weak or contaminated.
2. If equipped, remove and discard the transmission fluid in-line filter.
3. Remove the transmission fluid cooler bypass valve and install rubber hoses in its place.
4. To aid in attaching the cleaner to the transmission steel cooler tubes, connect 2 additional rubber hoses to the transmission end of the steel
transmission cooler tubes.
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Connect the cleaner tank pressure tubes to the steel transmission cooler return tubes (longest tube).
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Connect a tank return hose to the steel transmission cooler pressure tubes (shorter tube). Place the outlet end of this hose in the tank reservoir.
5. 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 cooler system).
6. Switch off the pump and disconnect the pressure hose from the transmission cooler return tube.
7. Use compressed air to blow out the cooler(s) and tubes (blow air into the transmission cooler return tubes) until all fluid is removed.
8. Remove the rubber return hose from the remaining steel cooler tube.
9. Remove the rubber hoses and reinstall the transmission fluid cooler bypass valve.
