[mp29a4]

I'm considering an ATF flush from the ATF cooler outlet on my '18 BE as more efficient that 3X dump/fill. I would drain fluid out of drain plug, refill (about 3-4 qts ATF). Then remove the filter and before completing install of new filter place the coolant outlet line in a container, run the engine until a quart comes out, then add another quart and repeat until only new ATF comes out. Am I overlooking anything as to why this is not a viable procedure? Thanks.

 

[mp29a4]

Thanks. I searched for such a thread but obviously did not find it. My proposed method (which I saw for another vehicle here:

) doesn't try to use the suction line as proposed by ChrisP but to drain the pan, fill (with the 3-4 quarts that drained out) and then just take out a quart at a time from the ATF cooler exit line and refill that quart into pan until mostly clear fluid comes out of the exit line from ATF cooler. I'm not saying this method is perfect but seems like it would get similar results to the 3x drain/fill more efficiently. I guess my diagram above does not show exactly where the filtered ATF re-enters the system. Do you know if the filtered ATF re-enters into the drain pan? If it does, then I believe this process could work reasonably well.