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Message: <blockquote data-quote="Shawn White" data-source="post: 996532" data-attributes="member: 70197">The tranny cooler lines are located on the passenger side of the truck. You'll see two 1/4 inch or 3/8 lines that run together from the under the radiator back to to the transmission. If you look into gap in the bumper, below the lic plate, to the right of the passenger side fog light you can see these two lines tie into rubber lines that run to the transmission cooler. Look for a leak where the steel lines transition to the rubber lines as well as the rubber hoses that tie into the tranmission cooler mounted on the passenger side in front of the radiator. A hose clamp could have popped loose, or the hose cracked with age, or the cooler could even be leaking.Also pop the hood and look at backside of  the radiator, at the drives side the trans cooler lines bolt into the radiator in two spots on the backside of the radiator below the radiator cap. You could also have a power steering leak a wells, since power steering fluid is also red.</blockquote>