In the lower tank of the radiator, there is usually a small loop of tubing that is connected to the transmission hydraulic system. Position the auxiliary transmission oil cooler so its inlet and outlet tubes face the existing transmission oil cooler lines. Transmission coolers have one job, keeping your car’s transmission fluid cool. I, too, will vote for not running your PS fluid through the radiator's in-tank cooler, for the same reason. Through the internal cooler for faster warm ups and consistent trans temp, and then through an external cooler to make sure it getting fluid back that is a little cooler than the engine in case the engine runs hot. Automatic transmissions generate heat in operation. If you follow their path, they will lead you to the fittings in the lower radiator tank at the front of the vehicle. The cooler fitting connection is inside of the transmission cooler which is inside of the radiator bottom tank. You'll of course need to add additional tubing so the lines reach the aux cooler One article says that tranny's for the 3.6 have a stand alone cooler with variable speed fan. If your cooling sys is marginal, the internal cooler isn't going to help by adding more heat. If you follow their path, they will lead you to the fittings in the lower radiator tank at the front of the vehicle. Many manufacturers are now also recommending the addition of a transmission cooler if you carry extra passengers or cargo (ie – vacation, car-pool), drive in stop-and-go traffic, drive in hot or very cold weather, or climb steep inclines. keakar, Oct 11, 2014 #12. Some vehicles manufactured after 1975 will have transmission coolers built into the car's radiator, as will most trucks designed for towing. Inlet is the line closest to the engine. The hoses used for oil transfer are usually very stiff and tough, which means they can withstand high pressure. Radiators usually have a tank on each side, and inside the tank is a transmission cooler. The oil cooler receives the transmission oil through a number of hoses which are connected between the transmission output and the oil cooler in the radiator. This will provide the most efficient transmission fluid cooling system for your vehicle. They channel hot transmission fluid to the radiator, where it is cooled, then return it back to the transmission. They typically resemble brake lines and are made of metal. The rods, usually plastic, go through the transmission cooler and the radiator and secured with the fasteners. The transmission cooler is a small radiator that cools the automatic transmission fluid that circulates through the transmission.It can be a separate unit, or it may be integrated into the engine radiator. Frequently, they may get bent or … You could either go to AutoZone/O'Reilly/etc and buy the smallest generic trans fluid cooler they have, or perhaps go to a wrecking yard and remove one from whatever random vehicle you find. "Transmission Cooling: You must have a transmission cooler in your radiator regardless of what someone has told you for the transmission to last. These are the transmission cooler lines. You could use a stand-alone transmission cooler, but your vehicle’s transmission actually operates better at around 160-200 degrees than it does when cold. If a cooler is mounted in front of the radiator, then an a/c condenser is added, there will be excessive heat ( more than one would like )and a reduction in air flow. Good news: based on what I've seen on various OEM vehicles, a PS cooler can be very, very small. Transmission cooler lines leaking at the radiator puts car owners in a distressing situation. These are the transmission cooler lines. Install the cooler between the transmission and the radiator, so the fluid goes through the cooler before it goes through the radiator mounted cooler. A good radiator, with an adequate built in cooler works well. transmission fluid cooler B&M recommends the following guidelines for a successful and efficient installation: Route the transmission fluid through the stock radiator cooler, then through the supplemental B&M SuperCooler and then back to the transmission. Once the transmission fluid has breached the thread connection, it only has to get past the large O-ring in (Pic #3) to enter the coolant. Aside from adding a deeper-sump transmission oil pan to hold additional fluid, installing an external transmission oil cooler will also help by offering a greater amount of surface area. Transmission oil can reach extremely high temperatures during operation, and this fluid can be cooled down with an external oil radiator. Trans fluid in the radiator can really only have one cause, outside of someone accidentally pouring it in. This way, cooling load on the engine is reduced in warm or hot temps and the radiator mounted cooler can warm the transmission oil in cold weather. I do not have an electric fan. Most kits offer adhesive mounting pads that allow you stick the cooler right onto the radiator, but there are also usually extra mounting rods that you can insert between the radiator and the cooler's mounting flanges. Unlike other vehicles, the 2005 through 2010 Nissan Pathfinder, X-Terra and Frontier radiators have a problem. For the same reason, the addition of an auxiliary transmission fluid cooler isn’t just necessary for those who tow trailers anymore. NEVER bypass the radiator cooler if the vehicle will be operated in cold weather areas. Warm fluid from the transmission is forced under pressure through one line to the radiator for cooling. 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