WÄRMETAUSCHER MIT MISCHKAMMER

A heat exchanger (10), in particular for a motor vehicle, comprises a collector box (18) and at least one longitudinal row (R1, R2) of multi-channel flat tubes (12) through which a first fluid can flow. The collector box (18) is made up of stacked plates (22, 24, 26) including: a header plate (26) with at least one row of mounting slots (32) receiving an end portion of each tube (12), a distribution plate (24) comprising at least one row of distribution slots (36), a cover plate (22) comprising at least one row of collecting apertures (46, 48) which connect at least some of the distribution slots (36) to a manifold (28, 30), at least one collecting aperture (46, 48) being arranged between two adjacent distribution slots (36). Said collecting aperture (46, 48) is arranged in a main recess (50) provided in the bottom face (52) of the cover plate (22).