The seat cushions in my LTZ are not cooling. I have addressed it with the dealership on three separate occasions. The dealerships service personnel are now stating that the seats are working as designed. But they are not working at all. The seat backs cool slightly and the fans come on but no cooling on the bottoms and hardly none on the backs. I have even checked the cooling on other new models on the lot and those blow significant cool air up through the bottoms. Anyone have any suggestions on how to deal with the service department?