The ornamental design for an airdam for automotivevehicles, as shown and described.
FIG. 1 is a perspective view of an air dam for automotive vehicles showing
my new design, it being understood that the broken lines are for
illustrative purposes only;
FIG. 2 is a perspective view from the opposite side thereof;
FIG. 3 is a front elevational view thereof; and
FIG. 4 is an enlarged side elevational view thereof.