A first module for a fluid cooling system may have a control unit, a first communication unit, a pump for a cooling fluid, and a first heat exchanger. The first communication unit may be configured to receive signals from at least one second module, the signals having an identification feature of the second module. The control unit, on the basis of the identification feature, is designed for identifying the second module, checking whether the second module is system-compatible or authorized, and switching on the pump and/or the first heat exchanger depending on the presence of the system-compatible or authorized second module. A cooling fluid system may have the first module and a second module.