E 350 V10-6.8L VIN S (2006)
Transmission Cooler: Service and Repair
4R70W/4R75W - Automatic Transmission
Transmission Fluid Cooler-Backflushing and Cleaning
Material
1. CAUTION: Use only clean automatic 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; this will affect 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. To aid in attaching the cleaner to the transmission steel cooler lines, connect two additional rubber hoses to the transmission end of the steel
transmission cooler lines as described below.
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Connect the cleaner tank pressure line to the transmission fluid cooler return tube.
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Connect a tank return hose to the transmission fluid cooler return tube. Place the outlet end of this hose in the reservoir.
4. Remove the cooler bypass valve from the cooler tubes. Install rubber hoses in place of the cooler bypass valve while flushing the cooler and lines.
5. Turn on the pump and allow the 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 tube) until all fluid is removed.
8. Remove the rubber return hose from the remaining steel cooler tube.
9. Remove the rubber hoses and install the bypass valve.
