One problem related to automatic transmission cooler has been reported for the 2001 Ford F-350. The most recently reported issues are listed below.
The contact owns a 2001 Ford f350 super duty. During the summer months when the temperature is 75 degrees and above, the vehicle leaks transmission fluid. While under warranty, the vehicle was taken to the dealer and they added dye to the fluid. They stated that the pump seal was leaking. During the winter months, there was hardly any leakage. The contact stated that the overflow hose was not large enough for the fluid to run through it, and that it was a design defect. The vehicle currently has two transmission coolers. The current mileage was 125,000 and failure mileage was 81,000.