Abstract: A radiator is laterally mounted between a pair of right and left frames arranged parallel to each other. The radiator has an upper tank and a lower tank and is mounted onto the frames by means of pins and brackets, the pins going through orifices in the brackets. No particular fitting work is required. The number of the fastening elements for mounting the radiator is reduced and the assembly may be carried out more easily because the radiator may be mounted from the outside of the frames. Further, there are provided two upper and bottom discontinuous spaces formed by a shroud which surrounds the outside of the radiator, and heat generated when the engine is idle, may be dissipated.