A fluid cooling apparatus (5) includes at least one heat exchanger device for cooling at least one working or cooling fluid heated or used during the operation of movable machines (1). The machine has an outer engine covering (11) to cover engine, motor or chassis parts and has a tank (9) containing the working and/or cooling fluid with a predeterminable wall outer contour (7). At least parts of the wall outer contour (7) are pan of the engine covering (11).