Tranny fluid supply lines

[dwd1985]

Finally got around to installing my permacool tranny filter, and in the process, ran into a small problem. The instructions say, quote, "Locate the transmission fluid lines. They can be found running from the transmission to the bottom or the side of the radiator. Determine which is the supply line (pressure hose) by starting the engine and feeling both transmission fluid lines. The warmer line is the supply line." Well while under the car, looking forward towards the bumper, there are 3 lines going into the radiator. I really did not feel like sitting under the car with the engine on, and I tired letting it run, and then jacking it up again, but felt no significant difference in temperature. So can someone who has put on their own filter let me know which hose they figured it out to be? Looking forward towards the bumper, is it the drivers side, the center hose, or the passenger side?