recently 04 TSX (40k miles)started making light whining noise mostly at 1-2 shift occasionally. i had used drain and fill with Honda Z1 twice in the past 2 years. not happy with the Z1 after hearing the whining noise i want to try some other atf this time. i want to do cooler line ATF flush (first timer..), i want to remove as much Z1 as possilbe, i hope someone with more knowledge and experiences can help me on some of the question.. 1. when i disconnected the cooler line, the return line goes into atf drain bucket. what to do with another end? shall i plug the inlet line? i know i suppose to deliver new ATF to the pan, but will inlet take new fluid during the flush? 2. this car has an filter on the return line between cooler and transmission body. I can not see in/out hoses around ATF cooler very well, but i ATF filter can be seen and easily reached. i was thinking about disconnect the ATF hose around filter instead of cooler area for ATF flush purpose? is this a good idea and also shall i disconnect the filter during the flush? 3. i am worry about air bubble created during the flush (air enter from disconnected area, and new fluid, am i worry too much? thanks in advance!!