After cooler, charge air cooler and turbulator assemblies and methods of making the same

A charge air cooler comprising a plurality of spaced generally parallel turbulators, each said turbulator comprising an outer channel member having a bottom wall and two transverse side edges, an inner channel member having a bottom wall and two transverse side edges, the side edges of the inner channel interfitting closely within the side edges of the outer channel member to form an adjustable depth generally rectangular enclosure, an accordian shaped fin assembly between said channels having side edges of a plurality of accordian folds which extend above the channel side edges in contact with the bottom wall of both the inner and outer channel members, a transverse heat exchanger fin assembly between adjacent turbulators, frame means surrounding said turbulators and heat exchangers, header means at each end of said turbulators, and flange means around the periphery of each of said header means forming therewith one of an inlet and outlet well whereby the turbulator ends may be operatively connected to a source of fluid to be cooled.