Expedition 4WD V8-4.6L SOHC VIN 6 (1997)
Transmission Cooler: Service and Repair
Cooler Bypass Valve
Cooler Bypass Valve cleaning
1. Remove the cooler bypass valve (CBV).
2. Using the Torque Converter/Oil Cooler Cleaner and adapter kit flush the transmission CBV assembly.
3. Plug the CBV front fitting with a 13 mm x 1.5 mm threaded plug.
CAUTION: Make sure the CBV is in the solvent tank before turning on the solvent. Also, make sure the fitting is pointed down so solvent does
not spray upward out of the tank.
NOTE: The solvent pressure must be a minimum of 50 psi to overcome the valve inside the cooler bypass tube and let solvent flow. Do not
exceed 90 psi.
4. Place a 1/2 inch flat washer and connect the cleaner pressure line over the fitting that screws into the case out hole.
5. Place the CBV valve into the solvent tank. Regulate the solvent pressure to between 50 and 90 psi. Turn on the solvent and circulate for 5 minutes.
NOTE: The Torque Converter/Oil Cooler Cleaner can be switched on and off to help dislodge the contaminants.
6. Disconnect all rubber hoses from the CBV.
7. Use regulated compressed air to purge the CBV of solvent.
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Remove the plug from the CBV.
