| The cracks could have been caused by rocks or other flying debris, but you said that they were behind your grille, they might not be a good quality foglight (you get what you pay for), or they might not have been sealed correctly, had gotten water in them, and cracked when they had gotten cold, if they are new, or recently purchased I would take them back, and get them replaced, or just go there and bit&h until they get sick of you and pay you to go away |