I am looking at installing a transmission cooler to completely bypass the factory tarnsmission cooler that is built in to the radiator as a preventative measure. The 2005 - 2006 Nissan Pathfinders have had issues with the radiator leaking and the radiator coolant being mixed with the transimission oil and destroying the transmission. Is this advisible, would I need to install a sperate thermostat and what size would I need since I am compeletly bypassing the factory cooler. Thank you
asked by: Jason R
It is possible to install a transmission cooler and bypass the factory transmission cooler on your 2006 Nissan Pathfinder. This is not recommended by manufacturers, but it is possible. You will want to get the largest transmission cooler that will fit your vehicle. I do not know the area that you have available to install a transmission cooler, but if it will fit, I would recommend the Derale Series 8000 Plate-Fin Transmission Cooler Kit, part # D13504. The overall dimensions for this cooler are 11 inches wide, 12 inches tall and 7/8 inch deep. Measure the height, width and depth of the area where you want to mount the transmission cooler and those dimensions will help you select the appropriate size cooler.
The best place to mount the transmission cooler is between the AC condenser and the grill. You will first want to cut off the transmission lines going to and from the radiator. It is very important that you plug the lines you cut coming from the radiator because you do not want the radiator coolant leaking out. You can then attach the a rubber hose to each transmission line and run those to the inlets on the new transmission cooler.
I have attached two images showing how the hoses and lines attach to bypass the radiator and the preferred mounting location for the transmission cooler. You will not need a separate thermostat because the temperature of the transmission fluid does not need to be regulated, however if you wanted to monitor your transmission temperature you could get the Bully Dog WatchDog Monitor, # BY40402. This will allow you to view other vital functions in your engine as well.
expert reply by: John H
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