Abstract: The invention relates to a heat exchanger (1), in particular for a motor vehicle, comprising a header tank (9a) and a bundle of tubes, said header tank (9a) comprising a collector plate (21), a cover (23) and a seal located between the collector plate (21) and the cover (23), said header tank (9a) being divided into two compartments (15a and 15b) by a transverse partition (17), said compartments (15a and 15b) being configured to communicate respectively with two parts of the bundle, said seal isolating said compartments (15a and 15b) from one another and partially closing off the opening of at least one tube, said partially closed-off tube (51), opening into said header tank (9a) near said transverse partition (17).

Abstract: The present invention relates to an end plate for a heat exchanger, running longitudinally, comprising at least one opening (5, 5?, 5?), said opening (5, 5?, 5?) forming a cut in the end plate (1), and at least two areas of weakness (6, 6?), characterized in that the two areas of weakness (6, 6?) are situated in distinct parallel planes. It also relates to an exchanger equipped with such an end plate.