Component Test
WARNING: This page is about a different car, the 2015 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
Transmission Fluid Cooler Leaks at Radiator
Transmission fluid may leak between the radiator transmission fluid cooler and the transmission fluid cooler fitting (not the transmission fluid cooler tube into the transmission fluid cooler fitting), which may result in a residue of transmission fluid on the radiator tank around the transmission fluid cooler fitting. Insufficient thread sealer on the transmission fluid cooler fitting may cause this.