A method for controlling a thermal regulation circuit of a vehicle. The circuit includes first and second heat exchangers situated in series in a direction in which an air flow is intended to pass through each heat exchanger. The circuit also includes an additional heat exchanger situated upstream of the first heat exchanger with respect to the air flow. The circuit is configured to allow a refrigerant fluid to circulate through the first exchanger and also configured to allow a heat-transfer fluid to circulate through the second exchanger and through the additional exchanger. The method includes generating or increasing a flow rate of the heat transfer fluid in the additional exchanger depending on operating modes of the circuit.

A pressure vent valve for ventilation of the interior of a motor vehicle, with a frame with at least one sealing surface and with at least one flexible valve flap mounted on the frame. In an idle position, the valve flap assembly abuts the sealing surface to prevent airflow through the pressure vent valve. When a sufficient pressure occurs, the valve flap assembly assumes an open position lifted from the sealing surface to allow airflow through the pressure vent valve. The pressure vent valve further includes an installation indicator formed in or on the frame to ensure alignment during installation.

An air conditioning system having: a housing with a second fluid inlet, a second fluid outlet, and a second fluid circuit provided therebetween; a heat exchanger for the first fluid, at least partially encapsulated within the housing; a blower housing with a blower motor configured to accelerate the second fluid circulation through the second fluid circuit. The blower housing is at least partially encapsulated within the housing so that the blower motor is located at the lower level than the heat exchanger. The housing includes a filtering compartment located in the vicinity of the second fluid inlet. The filtering compartment further includes a filtering component, a filter fluid evacuation circuit for condensation fluid that condenses on the surface of the filtering component, and a second opening configured to evacuate the filter fluid from the housing. The second opening is fluidly connected to the filtering compartment.