A seal (15) adapted to be mounted under a radiator of a motor vehicle has a rigid part (16) with a profile adapted to fit with a lower cheek (13) of the radiator by clamping, the lower cheek (13) of the radiator having a pair of opposite falling edges (131, 132) and a flexible member (17) having at least one flexible sealing lip (170) adapted to extend below a profile opposite to the lower cheek when the seal is mounted below the radiator, the profile having a U-shaped cross section, wherein each branch (161, 162) suitable for engaging with a corresponding falling edge of the falling edge pair,The branch cooperates with at least one outer wall of the corresponding falling edge of the falling edge pair, and the web (160) of the U-shaped section is designed to extend between the falling edge pair relative to the bottom surface (130) of the radiator.Figure published with summary: Figure 1
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