Abstract: A composite heater apparatus for vehicles uses integrated tube which is partitioned from a coolant heater core tube part, in which coolant circulates, and an oil cooler tube part, in which engine oil circulates, and includes heat exchanging fin which is in contact with both the coolant heater core tube part and the oil cooler tube part to perform a heat exchanging process. Each header, which is coupled to each of opposite ends of the core tube, is partitioned from coolant circulation space and oil circulation space, via a partition walls. The partition wall includes a surface enlarging member to increase heat exchanging performance using heat conduction. When a vehicle is started in winter, in the initial operation stage of an engine, the vehicle is quickly heated, using the heat of engine oil which is heated prior to engine coolant.

Abstract: A floor panel for a vehicle having a reinforcing structure includes: a luggage room which is formed at the rear of a passenger space and holds at least one piece of luggage; a floor box which is formed at a floor of the luggage room and receives at least one small piece of luggage; a main panel which is made of poly-propylene material; sub panels which are respectively coupled to an upper surface and a lower surface of the main panel and are made of glass mat thermoplastic (GMT) material; and panel protectors which are respectively coupled to outer surfaces of the sub panels and are made of nonwoven fabric. The floor panel is flat, plate shaped and opens and closes the floor box.