Fan control unit for a modular cooling system

A fan electronic control unit for a cooling system of a power source being a combustion engine, comprising a plurality of modular heat exchanger modules, where each modular heat exchanger module is provided with a cooling fan, where the fan electronic control unit is provided with an input for receiving a fan control signal from a power source, and with two or more separate output ports, where each output port can drive one cooling fan or several cooling fans arranged in series or where the at least two or more separate outputs are connected to a larger fan, where each output port is configured to the used cooling fan with regards to output voltage, type of output and output current, characterized in that the fan electronic control unit is arranged to control the cooling fans in dependency of the fan control signal and the number of cooling fans by the output ports being activated depending on the number of connected cooling fans and further comprises a controller area network (CAN) port, adapted to communicate with one or more electronic control units attached to a CAN bus, or a universal serial bus (USB) port used to configure the fan electronic control unit to the actual number of cooling fans and the type of used fans.