heat exchangers or zones each having its own inlet and outlet then any number of baffles could be used to divide up heat exchanger 10 into separate heat exchangers also the baffles could be used selectively in both the manifolds 26 28 to cause the coolant to flow in a serpentine path through the heat exchanger if desired in fig8 baffles 86 93 94 and 95 are shown having bifurcated inner ends to engage the mating flange extensions 62 these bifurcated ends 96 also help hold flange extensions 62 together during assembly of heat exchanger 10 baffles 86 94 and 97 also have resilient wall portions 98 to act as springs to ensure a good seal against the u shaped channel rear wall 68 and to accommodate any movement of the heat exchanger components while they are being joined together such as by brazing it is also possible to fasten baffles to the rear wall 68 of the u shaped channel 26 by mechanical fasteners as illustrated in fig1 wherein an illustrative baffle 200 is shown as affixed to the manifold 26 by a rivet 202 0044 fig7 shows another preferred embodiment wherein the plate raised peripheral edge portions 50 52 are formed with transverse notches 100 instead of slots 84 as in the embodiment of fig6 notches 100 are located inwardly of but.