F 150 4WD Pickup V8-4.6L VIN W (2006)
Transmission Cooler: Component Tests and General Diagnostics
Transmission Fluid Cooler Leaks at Radiator
Transmission fluid may leak between the radiator transmission fluid cooler and the transmission fluid cooler fitting (not the cooler line into the fitting),
which may result in a residue of transmission fluid on the radiator tank around the fluid cooler fitting. Insufficient thread sealer on the transmission
fluid cooler fitting may cause this.
1. Clean the area around the transmission fluid cooler fittings.
2. Verify that transmission fluid is leaking between the transmission fluid cooler and the transmission fluid cooler fitting (not the transmission fluid
cooler line fitting into the transmission fluid cooler fitting).
3. Remove the radiator from the vehicle and place it on a flat surface with the transmission fluid cooler fittings facing upward. For additional
information, refer to Cooling System.
4. CAUTION: Oil based solvents and cleaners should not be used when cleaning the radiator. Oil based solvents and cleaners can damage the
radiator end tank seals and cause leaks.
Clean the area around the transmission fluid cooler fittings so that contaminants do not enter the transmission fluid cooler when the transmission
fluid cooler fittings are removed.
5. NOTE: Remove only one transmission fluid cooler fitting at a time, otherwise the cooler may drop into the radiator.
Remove the upper transmission fluid cooler fitting.
6. Once the fitting is removed from the transmission fluid cooler, verify that there is a gasket between the transmission fluid cooler and the inside of
the radiator tank.
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If there is no gasket, install a new radiator.
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If there is a gasket, proceed to the next step.
