Abstract: The invention relates to a method and to a device for cooling a motor, the motor driving at least one, at least two-stage compressor (2) of a coolant circuit (1), which includes at least one first compression stage and a second compression stage (4), and a coolant is conducted through the coolant circuit (1), which is brought from a low pressure level to a medium pressure level in the first compression stage (3), and from the medium pressure level to a high pressure level in the second compression stage (4), and which is then expanded to the medium pressure level following the second compression stage (4) while outputting heat.