Abstract: A clad material for a cooler is provided by executing production of a tensile strain of 3 to 10% or rolling at a finish rolling ratio of 10 to 25%, and optionally performing a heat treatment for 1 to 8 hours at a temperature within a range from 150 to 400° C., on a clad raw material having a three layer structure of a core material, a first brazing filler metal layer that covers one side (the surface on the side of a cooling water passage) of this core material, and a second brazing filler metal layer that covers the other side (the surface on the opposite side from the cooling water passage). Specific ranges are prescribed for certain properties before and after brazing.

Abstract: A clad material for a cooler is provided by executing production of a tensile strain of 3 to 10% or rolling at a finish rolling ratio of 10 to 25%, and optionally performing a heat treatment for 1 to 8 hours at a temperature within a range from 150 to 400° C., on a clad raw material having a three layer structure of a core material, a first brazing filler metal layer that covers one side (the surface on the side of a cooling water passage) of this core material, and a second brazing filler metal layer that covers the other side (the surface on the opposite side from the cooling water passage). Specific ranges are prescribed for certain properties before and after brazing.

Abstract: A heat exchanger has a clad thin sheet material, a clad thick sheet material that is disposed so as to define a passage between the clad thick sheet material and the clad thin sheet material, and that has a sheet thickness greater than that of the clad thin sheet material, and an inner fin held between the clad materials. The clad thick sheet material and the clad thin sheet material have Zn-containing brazing filler metal layers on their passage sides, respectively, and the post-brazing surface Zn amounts are set so as to satisfy specific conditions. Further, certain conditions concerning the compositions of each of the layers that constitute the clad materials, and the inner fin are set.