F 350 4WD Super Duty V8-6.4L DSL Turbo (2008)
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 tube 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 tube 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. 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.
