Transmission Cooler Installation - 2009 Nissan Xterra

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How to Install a TranSMIssion Cooler on a 2009 Nissan Xterra


Today on our 2009 Nissan Xterra we'll be installing the Derale Series 8000 Plate-Fin Transmission Cooler Kit, part number D13502. Our first step will be removing the manufacturer's grill. To do that, across the top there are six push-pin fasteners to be removed. To remove the push-pin fasteners, we'll take a flat-bladed screwdriver, pry on in the center and then remove the entire push-pin fastener. With all six removed, there are two center attachment points where we'll reach in through the top of the grill, press in the locking tab to release the two attachment points, and then there are four more underneath the center bumper support. We'll press on the locking tab, which will release the grill from its position. Now that we have the grill removed, you can see the fasteners that we're securing it. Now with the vehicle in the cold or cool temperature, we'll go ahead and start and run the vehicle until the transmission warms up, checking the temperature at both the in- and outlet, which will be determined as the vehicle warms up.

The side that gets warm first, or hot first, will be our inlet and the bottom, on this application, will be the return or outlet. The bottom, then, will be the side that we want to connect to. Before we make our connections, we'll first go ahead and mount the new transmission cooler. To mount it, we'll be using some self-tapping screws and attaching it directly to the upper core support. Now with that done, we'll start making our connections with the transmission cooler lines. We'll first need to remove the lower hose from the manufacturer's cooler.

To do this, we'll use a pair of pliers, spread the clamp and slide it down the hose. Then we can remove the hose. Now we'll take the new hose and slide it onto the metal line or return. This will help prevent the fluid from leaking out. Next we'll take one of the new worm gear clamps provided with our install kit, slide it over the new hose and into position over the return nipple. Once it's in position, we'll go ahead and tighten it down.

Then we'll use the adapter provided with our install kit and slide it into the old line that we just removed from the manufacturer's cooler. Using the previous squeeze clamp, we'll slide the clamp up into place and tighten it down. Now with our adapter installed, we'll go ahead and take the new line that we ran from the return of the manufacturer's transmission cooler over to the new cooler that we installed. We'll check our length and then cut off the excess line. We'll install our clamp. Now we can go ahead and remove the protective cover off the nipple of the new cooler and then slide the hose onto the new cooler.

Quick tech tip: I recommend to use some new transmission fluid as lubricant on the hose and nipple fitting, make it easier to slide the hose into position. Now with the hose into position, we'll slide the clamp up into place and tighten it down. Now we'll repeat the same process installing the new hose onto the adapter, running it up to the second nipple on the new transmission cooler. Once we have the hose in place, we can go ahead and tighten it down. Quick tech tip: Now is a good opportunity to go ahead and check for leaks by starting the vehicle. With your foot firmly on the brake, we'll put it into gear, raising up the RPMs. This will simulate driving down the road, allowing us to check for leaks when the vehicle is in a simulated drive position. Once we're comfortable knowing that there are no leaks, we'll turn the vehicle off and reinstall the front grill. Now with that done, this will complete the install of the Derale Series 8000 Plate-Fin Transmission Cooler Kit, part number D13502, on our 2009 Nissan Xterra. .


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