A tapered section and a flange section which constitute reinforcements are provided
on mounting members to which a blower (fan shroud) is to be attached. The reinforcements
are provided on the sides of the reinforcements which are in contact with a longer
side wall surface of a rectangular tank. According to this structure, it is possible
to prevent the longer side wall surface from deforming, while mitigating the concentration
of stress to the joint portions between the mounting members and the longer side
wall surface. Therefore, the mechanical strength, reliability and durability of
the header tank can be improved without increasing the mass (weight) and production
cost of the radiator.
