A modular system for a 1-to-4 zone climate control system for vehicles, which is provided with at least one housing and several air tempering and air distribution devices including a fan, optionally a filter, an evaporator, a heater and several doors arranged at a partition that is placed orthogonal to the evaporator and provided to divide the total volume flow into two partial volume flows for the left and right vehicle sides. In the first configuration the partition is provided with several blind fittings for the closing of the flow paths associated with air outlets and air channels of a second configuration. In the second configuration, the blind fittings are replaced with additional doors enabling the use of the air outlets and air channels of additional zones.