Control device for a motor-vehicle exchanger fan electric motor, said device comprising: - a power electronic circuit having a power input that is intended to be connected to a DC electrical power source, having a power output that is intended to be connected to the exchanger fan electric motor, having at least one insulated-gate field-effect transistor the source-drain circuit of which is connected between the power input and the power output in order to be in series with the exchanger fan electric motor, and having at least one flyback diode that is connected in reverse bias to the power output in order to allow the current generated by the inductive component of the exchanger fan electric motor to flow when the insulated-gate field-effect transistor is turned off; - a filtering circuit that is connected to the power input, in order to decrease the amplitude of the high-frequency components of the currents and voltages generated by the inductive component of the exchanger fan electric motor during the turn-off of the insulated-gate field-effect transistor, and that includes one or more electrolytic capacitors (12, 13, 14); - a switching control unit that is able to generate, on the gate of the insulated-gate field-effect transistor, a width-modulated square-wave control signal; and - a housing containing at least the power electronic circuit and the filtering circuit; characterized in that: - the housing comprises at least one ventilated compartment that contains a first interior cavity that is bounded by a first peripheral wall that is equipped with apertures (16f, 16g) in order to permit the passage, into the first interior cavity, of an air flow originating from outside the housing; - the housing comprises at least one isolated compartment that contains a second interior cavity that is bounded by a second peripheral wall and that is separated from the ventilated compartment by at least one thermally insulating wall; - the one or more insulated-gate field-effect transistors and the one or more flyback diodes are placed in the second interior cavity of the isolated compartment; and - the one or more electrolytic capacitors (12, 13, 14) are placed in the first interior cavity of the ventilated compartment. - a power electronic circuit having a power input that is intended to be connected to a DC electrical power source, having a power output that is intended to be connected to the exchanger fan electric motor, having at least one insulated-gate field-effect transistor the source-drain circuit of which is connected between the power input and the power output in order to be in series with the exchanger fan electric motor, and having at least one flyback diode that is connected in reverse bias to the power output in order to allow the current generated by the inductive component of the exchanger fan electric motor to flow when the insulated-gate field-effect transistor is turned off; - a filtering circuit that is connected to the power input, in order to decrease the amplitude of the high-frequency components of the currents and voltages generated by the inductive component of the exchanger fan electric motor during the turn-off of the insulated-gate field-effect transistor, and that includes one or more electrolytic capacitors (12, 13, 14); - a switching control unit that is able to generate, on the gate of the insulated-gate field-effect transistor, a width-modulated square-wave control signal; and - a housing containing at least the power electronic circuit and the filtering circuit; characterized in that: - the housing comprises at least one ventilated compartment that contains a first interior cavity that is bounded by a first peripheral wall that is equipped with apertures (16f, 16g) in order to permit the passage, into the first interior cavity, of an air flow originating from outside the housing; - the housing comprises at least one isolated compartment that contains a second interior cavity that is bounded by a second peripheral wall and that is separated from the ventilated compartment by at least one thermally insulating wall; - the one or more insulated-gate field-effect transistors and the one or more flyback diodes are placed in the second interior cavity of the isolated compartment; and - the one or more electrolytic capacitors (12, 13, 14) are placed in the first interior cavity of the ventilated compartment.