Method for managing a reversible indirect air-conditioning circuit for a motor vehicle comprising a first refrigerant loop in which a refrigerant fluid circulates and comprising a first dual-fluid heat exchanger arranged jointly on the first refrigerant loop and on a second heat-transfer fluid loop in which a first heat-transfer fluid circulates, the first dual-fluid heat exchanger being disposed so as to allow the heat exchanges between the first refrigerant loop and the second heat-transfer fluid loop, the first refrigerant loop comprising: • a compressor, • the first dual-fluid heat exchanger, disposed downstream of said compressor, • a first expansion device, • a first heat exchanger being intended to be passed through by a flow of air internal to the motor vehicle, • a second expansion device, • a second heat exchanger being intended to be passed through by a flow of air external to the motor vehicle, and • a bypass loop of the second heat exchanger, • a device for redirecting the coolant coming from the first heat exchanger to the second heat exchanger or to the bypass loop, said circuit comprising a temperature sensor for the flow of inside air at the output of the first heat exchanger, said circuit being able to operate according to a total dehumidification mode derived from a heat pump mode, in which the flow of inside air is cooled at the first heat exchanger then reheated at an internal radiator of the second heat-transfer fluid loop, before arriving in the vehicle interior and in which the first and the second heat exchangers are intended to operate simultaneously, characterized in that the indirect reversible air-conditioning circuit comprises a central control unit linked to said temperature sensor for the flow of inside air and capable of driving the device for redirecting the coolant, when the indirect air-conditioning circuit is in total dehumidification mode, the central control unit controls the device for redirecting the coolant in such a way that: • if the temperature measured at the temperature sensor for the flow of inside air is greater than or equal to T + Y1, the device for redirecting the coolant allows the passage of the coolant in the bypass loop, in which T is a temperature setpoint value of the flow of inside air at the temperature sensor and Y1 is a temperature differential lying between 0 and 3°C, • if the temperature measured at the temperature sensor for the flow of inside air is less than or equal to T - Y2, the device for redirecting the coolant prevents the passage of the coolant in the bypass loop, in which T is a temperature setpoint value of the flow of inside air at the temperature sensor and Y2 is a temperature differential lying between 0 and 3°C. • a compressor, • the first dual-fluid heat exchanger, disposed downstream of said compressor, • a first expansion device, • a first heat exchanger being intended to be passed through by a flow of air internal to the motor vehicle, • a second expansion device, • a second heat exchanger being intended to be passed through by a flow of air external to the motor vehicle, and • a bypass loop of the second heat exchanger, • a device for redirecting the coolant coming from the first heat exchanger to the second heat exchanger or to the bypass loop, said circuit comprising a temperature sensor for the flow of inside air at the output of the first heat exchanger, said circuit being able to operate according to a total dehumidification mode derived from a heat pump mode, in which the flow of inside air is cooled at the first heat exchanger then reheated at an internal radiator of the second heat-transfer fluid loop, before arriving in the vehicle interior and in which the first and the second heat exchangers are intended to operate simultaneously, characterized in that the indirect reversible air-conditioning circuit comprises a central control unit linked to said temperature sensor for the flow of inside air and capable of driving the device for redirecting the coolant, when the indirect air-conditioning circuit is in total dehumidification mode, the central control unit controls the device for redirecting the coolant in such a way that: • if the temperature measured at the temperature sensor for the flow of inside air is greater than or equal to T + Y1, the device for redirecting the coolant allows the passage of the coolant in the bypass loop, in which T is a temperature setpoint value of the flow of inside air at the temperature sensor and Y1 is a temperature differential lying between 0 and 3°C, • if the temperature measured at the temperature sensor for the flow of inside air is less than or equal to T - Y2, the device for redirecting the coolant prevents the passage of the coolant in the bypass loop, in which T is a temperature setpoint value of the flow of inside air at the temperature sensor and Y2 is a temperature differential lying between 0 and 3°C. • if the temperature measured at the temperature sensor for the flow of inside air is greater than or equal to T + Y1, the device for redirecting the coolant allows the passage of the coolant in the bypass loop, in which T is a temperature setpoint value of the flow of inside air at the temperature sensor and Y1 is a temperature differential lying between 0 and 3°C, • if the temperature measured at the temperature sensor for the flow of inside air is less than or equal to T - Y2, the device for redirecting the coolant prevents the passage of the coolant in the bypass loop, in which T is a temperature setpoint value of the flow of inside air at the temperature sensor and Y2 is a temperature differential lying between 0 and 3°C.