If it is a cooler fault, the ATF warning lamp would be on all the time indicating high temperature.
I still don't see the reason why the oil cooler is being faulted for the problem.
Unless the original cooler inside the radiator is clogged resulting in inefficient cooling, the cooler have nothing to do with the torque converter failing.
You mentioned the loss of mileage after initial rebuild and I believe it could be something inside the trans that has failed instead of the torque converter.
Please consider a to help us answer more questions.
Sunday, January 9th, 2011 AT 10:48 PM