(57) A cooling radiator for motor vehicles, of the type having at least one reversal in
the direction of flow of the coolant liquid, comprises at least one manifold (2) provided
with at least one partition (6) which divides the manifold into two chambers (8, 7),
arranged one downstream of the other. The radiator includes one-way valve means (15)
for controlling an aperture (22) in the partition (6), which allow the coolant to
flow towards the downstream chamber through the aperture (22) when the pressure difference
between the two chambers (7, 8) exceeds a predetermined value.
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