The fan blowers, for a vehicle heating/air conditioning system (1), have a common control (6) for their individual electromotors (4) in the fan assembly (5). The control sets the current supply to the fans, where at least one is a booster fan.

The controller has a power supply cable, and a control cable which transmits a control signal to a regulator for regulating an auxiliary heater such that the power supply cable simultaneously serves as the control cable. The control signal has a rectangle-...