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There IS A THEORY that heat rises,,, The fluid,, in theory,, SHOULD go into the top and,, as it cools,,, travel through the cooler and EXIT THE BOTTOM and return to the transmission... If you put it the other way,,,, the fluid won't get as cool,, because EVERYONE KNOWS that HEAT RISES ???? Make sense????



Actually everyone THINKS heat rises when in fact hot AIR rises and heat goes where it's pointed.

You usually want to pump fluid into a cooler from the "bottom" and return from the "top" so that no air can get trapped in the cooler and reduce it's efficiency. An example of this is if you hook up the heater hoses backwards on a heater core you will get a lot less heat in the car than if they are connected properly.

Kevin

OH BOY.. If you take an infrared temp gun and point it at the top of the cooler ,, it will be HOTTER than the bottom of the cooler regardless of WHERE the cooler lines are connected.... Another thing about putting the fluid IN the bottom and pulling it from the top,,,,,, WHO CARES if there is AIR anywhere,, it will be PUSHED OUT BY THE FLUID in a second or two... the bubbles couldn.t move faster than the flow of the trans fluid,, through the fluid... it will PUSH all of the air out of it.... IN the top and OUT the bottom... Hot on top and COOLER on the bottom.. KINDA LIKE the SAME WAY A RADIATOR WORKS....