the invention relates to a system for use in a motor vehicle , the system comprising a coolant container of a liquid circulation cooling circuit and a hydraulic oil container of a hydraulic power steering assembly , in particular for use in an internal combustion engine . the system is characterized in that the coolant container is designed in one piece with the hydraulic oil container so that the system forms a uniform component . furthermore , the invention relates to a method for influencing the temperature of a hydraulic oil of a hydraulic power steering assembly with the coolant container of the liquid circulatioin cooling circuit .