The 2006 Nissan Titan has a transmission system that circulates fluid throughout the engine to make sure the gears shift smoothly and prevent the engine from overheating. As the transmission fluid circulates through the engine, it heats up and then moves through the cooler hose into the radiator, where it cools off enough to begin the cycle again. Changing the hose on the Nissan Titan requires a specialty tool called a flare nut wrench to remove the nuts that attach it to the transmission and radiator.
Use the jack to raise the front the Titan. Secure the vehicle by lowering it onto jack stands; this will allow easier access to the underside of the engine. Slide underneath the truck and locate the transmission drain pan in the center of the engine. The drain pan is a large, metal tank surrounded by eight bolts. Place a drain pan beneath the center of the drain pan.
Remove the drain bolt in the middle of the drain pan with a 1/2-inch socket wrench. Allow the fluid to drain completely from the tank. Normally, this takes 10 to 15 minutes to finish. Replace the bolt.
Locate the transmission cooler line, which is a wide, vinyl hose, that runs from the side of the transmission to the bottom of the radiator. Use the flare nut wrench to remove the nuts that attach the hose to the transmission and the radiator. Twist the nut to loosen it and then pull the hose out. Place the new hose between the transmission and radiator. Fasten it with the old nuts. Lower the car from the jack stands.
Open the hood of the Nissan Titan. Locate the transmission dipstick, which is a yellow ring above the drain pan. Pull it out and place a funnel into the tube. Pour in 4 quarts of transmission fluid and close the hood.
