318ti.org forum - HOW TO: Replace Automatic Transmission Coolant Lines

23MAR2014 - @161,652 Miles I replaced the leaking Transmission Cooler Lines. I used 4 new O-Ring Seals and Ty-Wrapped the Lines to the two broken Routing Clamps. I refilled the Transmission Sump with ~1 Quart of Redline D4-ATF. A short test drive confirmed there are no leaks and the Transmission shifts smoothly. These lines were somewhat difficult to remove/install. I cut open a 19mm Box-end Wrench (used a Diamond Saw) in order to unthread/rethread the Lines where they connect to the Transmission – A 19mm Crow-Foot was useless. Fishing the lines through the maze of frontend components was a challenge – had to come from the back, long line first, then the short line...rotating the lines helped. I also had to remove a Cross-Bar to allow the Lines to drop out.