An exhaust gas recirculation heat exchanger assembly comprising: a tube having a first and second walls (20, 22) extending between a first lateral end and a second lateral end; and a fin structure received in the tube to form a cooling tube assembly, the cooling tube assembly defining a first channel, a second channel, and a plurality of intermediate channels that extend between the first and second channels (42, 44), the first channel being disposed between the first lateral end of the tube and a first fin of the fin structure, the second channel being disposed between the second lateral end of the tube and a second fin of the fin structure disposed opposite the first fin; the exhaust gas recirculation heat exchanger assembly comprising a clip that is coupled to the cooling tube assembly, the clip having at least one flow impeding portion (60, 62, 74), each flow impeding portion (60, 62, 74), being arranged to inhibit a fluid flow through at least one of the first channel, the second channel, and one or more of the intermediate channels, characterized in that the clip includes a first member which extends into the first channel, a second member that extends into the second channel, and a joining member that extends between proximal ends of the first member and the second member; wherein the first member is disposed parallel to but not coplanar with the second member; wherein the first member has an arm that is arranged as a generally planar member that is disposed parallel to at least a portion of the first fin and, is disposed generally perpendicular to the first wall and the second wall of the tube; wherein the at least one flow impeding portion (60, 62, 74), comprises a first projection that: - extends outwardly from the first member towards the first lateral end, - is arranged as a flow impeding portion that at least partially blocks or reduces the flow area of the first channel; - is resiliently coupled to the arm of the first member, and, - is harpoon shaped allowing an easy insertion of the clip; and wherein and end of the first projection that is disposed proximate the inner surface of the first lateral end of the tube has a shape that conforms with or is complimentary to the shape of the first lateral end of the tube. a tube having a first and second walls (20, 22) extending between a first lateral end and a second lateral end; and a fin structure received in the tube to form a cooling tube assembly, the cooling tube assembly defining a first channel, a second channel, and a plurality of intermediate channels that extend between the first and second channels (42, 44), the first channel being disposed between the first lateral end of the tube and a first fin of the fin structure, the second channel being disposed between the second lateral end of the tube and a second fin of the fin structure disposed opposite the first fin; the exhaust gas recirculation heat exchanger assembly comprising a clip that is coupled to the cooling tube assembly, the clip having at least one flow impeding portion (60, 62, 74), each flow impeding portion (60, 62, 74), being arranged to inhibit a fluid flow through at least one of the first channel, the second channel, and one or more of the intermediate channels, characterized in that the clip includes a first member which extends into the first channel, a second member that extends into the second channel, and a joining member that extends between proximal ends of the first member and the second member; wherein the first member is disposed parallel to but not coplanar with the second member; wherein the first member has an arm that is arranged as a generally planar member that is disposed parallel to at least a portion of the first fin and, is disposed generally perpendicular to the first wall and the second wall of the tube; wherein the at least one flow impeding portion (60, 62, 74), comprises a first projection that: - extends outwardly from the first member towards the first lateral end, - is arranged as a flow impeding portion that at least partially blocks or reduces the flow area of the first channel; - is resiliently coupled to the arm of the first member, and, - is harpoon shaped allowing an easy insertion of the clip; and - extends outwardly from the first member towards the first lateral end, - is arranged as a flow impeding portion that at least partially blocks or reduces the flow area of the first channel; - is resiliently coupled to the arm of the first member, and, - is harpoon shaped allowing an easy insertion of the clip; and wherein and end of the first projection that is disposed proximate the inner surface of the first lateral end of the tube has a shape that conforms with or is complimentary to the shape of the first lateral end of the tube.