Which Transmission Line is the Return Line on a 2008 Nissan Titan

Question:

I am installing a transmission cooler in series with the existing trans cooler Which side of the radiator is the return line to the transmission Seems this is the mystery question, called the service dept and they dont know Your help would be appreciated

asked by: William O

Expert Reply:

On many Nissan/Jatco automatic transmissions the rear transmission line is the return line. But an easy way to tell is to wait for the truck to be cold, then start it up and shift into drive for about 15 seconds. Then put it back in park and turn off the truck. Then under the truck carefully touch the transmission lines. One will be noticeably warmer. So that makes the cooler one the return line.

expert reply by: Michael H