Support frame (4) configured to bear a heat exchanger comprising a flange (22) for coolant to pass through, the frame comprising a lateral wall (12) in which a light (28) is produced, which is configured to be passed through by the flange (22), characterized in that the lateral wall (12) comprises at least one edge (34, 36) placed near an end of the light (28) and arranged at least partially through the light (28) so as to define an insertion path for the flange which is inclined relative to the normal to the lateral wall, the edge also being configured to form a point on which the flange pivots.