Abstract: Cooling assembly for vehicles, comprising a radiator including two collecting tanks made of plastic material, an element fastened to the radiator, and fastening means for the mutual fastening of the element and of the radiator, including two U-shaped seats on each of said collecting tanks and two pairs of engagement members fastened to said element. Each of said engagement members comprises a pivot formation with a cylindrical outer surface having circular section and each of said seats has an elastically deformable snap-on engagement surface having semi-cylindrical shape with circular section able to receive said pivot formation in snap-on engagement.