What ever you do, be sure and double wrench the fitting. I used a line wrench and a modified box wrench, as mentioned before. Apply penetrating oil and make sure everything is very clean before disconnnecting and reconnecting. The cooler has aluminum threads and the slightest amount of grit will gall the threads.

The lower line can be replaced by just taking the motor mount loose and jacking the engine just enough to slip the line out. However, many have had a frustrating time with the lower line and removal of the mount probably would be easiest.

__________________
Sam

84 300SD 350K+ miles ( Blue Belle )