The holes in the grille on the Chevrolet Cobalt are large enough. Therefore, it does not protect the radiator from stones and other objects very well. To avoid damage to the heat sink, you can install an additional security grid.
For this, either buy a full-time mesh mesh and install it, or buy any suitable metallic mesh, cut it in the form of an inlet to the air inlet and secure the homemouth to the original grate. To set the grid to the lower part of the grille you will need to remove the bumper and make holes in it.