A/T - AODE Cooler Return Line Filter Installation
TECHNICAL BULLETIN # 254TRANSMISSION: AODE
SUBJECT: Cooler return line
APPLICATION: Ford, Lincoln, Mercury
DATE: 1994
Cooler Return Line
When you install an in-line filter into a transmission's cooler line, you must install the filter into the cooler-to-transmission return line. This is critical, because this is the only way to catch any foreign material leaving the cooler before it reaches the transmission.
It is not unusual to assume that as a unit is improved and the design is modified through the years, that the cooler line orientation on the case remains the same. Unfortunately, this is not so on the Ford AODE.
The Ford AOD (also known as the FIOD or an AOT) cooler return line is the bottom line on the case.
The Ford AODE cooler return line is the one on top. Keep this in mind when installing your in-line filters.