Abstract: The present invention relates to a muffler used in a motor vehicle for cooling the engine exhaust gases. The muffler has an internal tubular member defining an internal chamber and a middle tubular member concentric in relation to and supported on the internal tubular member. The internal and middle tubular members form a first ring-shaped chamber adapted to connect to the exhaust pipe. The muffler also has an external tubular member being concentric in relation to and supported on the middle tubular member. The middle tubular member and the external tubular member form a second ring-shaped chamber with a third inlet portion. Hence, engine exhaust gases of the motor vehicle pass through the first ring-shaped chamber and are sufficiently cooled and depressurized by cooling air that passes through the internal and second ring-shaped chambers.

Abstract: The present invention concerns a heating device for motor vehicles comprising a heat exchanger with primary and secondary circuits. The said exchanger is connected, through a system of ducts to the passenger compartment of the vehicle and/or to the front and/or the rear windows of the same. The said device is intended to heat the said passenger compartment and/or to de-ice the said front and/or rear windows. Under the invention, the said heat exchanger (3) is placed at the engine (M) exhaust of the said vehicle (1). The exchanger (3) primary circuit (12) is on the one hand, connected to the outlet of any cylinders (C) of the engine (M) so as to be crossed by the exhaust gases from the latter and, on the other hand, it is connected to the manifold (13) leading to the muffler.