exchangers to the engine 12 and transmission 14 this is understood in the art and will not be described in detail with reference to fig2 shows a typical multi pass oil cooler heat exchanger that is used on a typical vehicle it may be understood that this style of heat exchanger can be used for any fluid however the current disclosure will describe it as a oil cooler it is also understood in the art that this is a two pass system but the description is the same for multi pass heat exchangers with greater than two passes the oil cooler 20 has an inlet 22 and outlet 24 in the first tank 26 a core section 28 connects the first tank 26 to the second tank 30 the core section includes a first plurality of tubes 32 in between the tubes is a series of fins 34 the first tank 26 is separated into two chambers an inlet chamber 36 and an outlet chamber 38 the two chambers are separated in the first tank 26 by a baffle 40 it is understood in the art that the baffle 40 may be known as a partition or any piece to isolate the two chambers from each other the baffle 40 is in a fixed position that separates the medium not shown in the inlet chamber 36 and the outlet chamber 38 the typical function of the oil cooler 20 is the oil or liquid medium not shown would flow into inlet 22 represented by arrow 42 the medium would fill the inlet chamber 36 and flow through the tubes 32 the.