How to Tap into Transmission Fluid Return Line on a 2012 Ford Expedition for a Transmission Cooler  

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Expert Reply:

The line that you will need to tap into is the transmission fluid return line. The easiest way to determine the return line on your 2012 Ford Expedition transmission is to start the truck, shift into drive but do not go anywhere. After about 15 seconds or so put the truck back in park and apply the emergency brake. Turn off the truck. Out of the 2 hoses attached to the transmission, one should be warmer than the other. The one that is cooler is the return line.

You can use radiator adapter fittings like the Derale Radiator Adapter Fittings for Ford Trucks, # D13025, but I have found that it is easier to simply cut the return line use compression fittings. To ensure you choose the correct compression fitting for your vehicle, you will want to measure the diameter of your transmission lines. The most common size is 3/8 inches, but it would be safe to measure first. I have attached links to the compression fittings that we carry, part # D13031, D13032, D13033.

I have attached a video of a transmission cooler installation on another truck. In this video you will see our installation technician cut the return line and install compression fittings. The truck in the video is different from yours, but it should give you an idea on how to install the cooler.

I also attached two help articles on transmission coolers for you to check out.

expert reply by: John H

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