The invention relates to a cooling circuit (2), especially for a motor vehicle transmission, comprising at least one heat exchanger (4, 5). According to the invention, two heat exchangers (4, 5) are serially connected. A first heat exchanger (4) causes heat to be conveyed from a first (10) to a second fluid (1, 3) while a second heat exchanger causes heat to be conveyed from the first (10) to a third fluid (9).