The invention relates to a circulation system with at least one first partial flow which can flow through a first heat exchanger and a second partial flow of a first medium. According to the invention, said system comprise also at least one second heat exchanger, in particular a charge air cooler, which can be penetrated by a first media flow, and at least one adjustable mixing element which can be penetrated, on the inflow side, by a first partial flow and/or a second partial flow and, on the outflow side, generates the media flow with a target temperature.