An automatic transmission fluid leak may develop from the rubber section of a transmission cooler line. In some cases the rubber section of hose can be replaced. In others, the complete cooler line must be replaced to correct this type of leak.
Car Problem Reports
Cadillac Eldorado Rubber Transmission Cooler Lines Can Leak Fluid
Cadillac Eldorado Problem
Visitor, 2001 Cadillac Eldorado, 135,000 mi
Tranny fluid was discovered to be very low. It was filled & the valve seal replaced. It continued to leak out. It is still in the garage now, not sure how to fix it.