Abstract: The invention concerns a heating system or air conditioning system for vehicles having a heater box and an operator unit which has to be arranged separately from the heater box in the passenger compartment. In order to hold the operator unit on the heater box until the point of final assembly and for the purpose of adjusting the operator unit during preassembly, a two-part assembly aid element is provided, of which one part is firmly connected to the heater box and the other part is firmly connected to the operator unit so that the operator unit is fixed so that it cannot be varied until final assembly on the heater box. In order to configure the assembly aid element so that it can be manufactured simply and at low cost, its two parts are formed by two plug-in parts of a plug-in connection which can be pushed one into the other and a clip-type interlock is included in the plug-in connection.

Abstract: A device for simultaneously adjusting at least two pivoted elements, in particular valves used for air distribution in a vehicle heating or air-conditioning system, has an operating unit with a control disc which is connected to a rotary knob and a control groove which is closed upon itself and into which at least two levers engage which are pivotably accommodated by the operating unit and whose pivoting movements are transmitted to the pivoted elements. Simple tolerance compensation and installation without subsequent setting work is possible when each lever has a separate pivot bearing. The pivoting movements, occurring when the control groove is followed, of the bearing pin of each lever, with a universal-joint arrangement in between which leads away essentially in the axial direction of the bearing pins and permits length compensation, are transmitted from the operating unit to pivoted levers mounted on the heating box side.