Abstract: A heat exchanger of a vehicle, comprising a frame, a plurality of parallel tubes extending between two opposite sides of the frame, a pair of headers, each of which is arranged at a corresponding one of the two opposite sides of the frame, and a protection grid, attached at a face of the heat exchanger and including a plurality of parallel grid elements, in which each of the grid elements is adapted to shield a corresponding tube of the heat exchanger. Fastening and supporting means are provided, by means of which opposite side edges of the protection grid are directly connected and firmly fastened to the frame or to the headers, and by means of which the protection grid is supported by the heat exchanger, and anchoring means, by means of which a lower edge of the protection grid is unfirmly retained to a lower side of the heat exchanger.