<p>A heat exchanger including a pair of manifolds. An inlet is disposed on one of the ends of the first manifold. A core extends between the manifolds for conveying a coolant therebetween and for transferring heat between the coolant and a stream of air. A cross-over plate is disposed in one of the manifolds to divide the associated one of the manifolds into an upstream section and a downstream section. The cross-over plate presents a plurality of orifices defining a cross-over opening area for establishing fluid communication between the upstream and downstream sections of the associated manifold. The cross-over opening area continuously increases along an axis away from the inlet. The total cross-over opening area is 30% to 300% of the upstream cross-sectional area of the tubes of the core.</p>
