The ornamental design for a frontportion of a passenger car, as shown and described.
FIG. 1 is a front perspective view for a “front portion of a passenger car” showing my new design,
FIG. 2 is a front perspective view thereof,
FIG. 3 is a front view thereof,
FIG. 4 is a rear view thereof,
FIG. 5 is a left-side view thereof,
FIG. 6 is a right-side view thereof; and,
FIG. 7 is a top view thereof.
The portions of the vehicle shown in lighter and faded contrast throughout the drawing specification are shown for illustrative purposes only and form no part of the claimed design.